US20040028752A1 - Topical pharmaceutical composition comprising a cholinergic agent or a calcium channel blocker - Google Patents

Topical pharmaceutical composition comprising a cholinergic agent or a calcium channel blocker Download PDF

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US20040028752A1
US20040028752A1 US10/214,333 US21433302A US2004028752A1 US 20040028752 A1 US20040028752 A1 US 20040028752A1 US 21433302 A US21433302 A US 21433302A US 2004028752 A1 US2004028752 A1 US 2004028752A1
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accordance
calcium channel
nitric oxide
channel blocker
administered
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US10/214,333
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Michael Kamm
Robin Phillips
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SLA Pharma AG
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SLA Pharma AG
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Priority claimed from GBGB9703750.1A external-priority patent/GB9703750D0/en
Priority to GBGB9703750.1A priority Critical patent/GB9703750D0/en
Priority to GBGB9727238.9A priority patent/GB9727238D0/en
Priority claimed from GBGB9727238.9A external-priority patent/GB9727238D0/en
Priority to IL13147798A priority patent/IL131477A0/en
Priority to EP98907038A priority patent/EP0969813B1/en
Priority to CN98802787A priority patent/CN1127333C/en
Priority to DE69826644T priority patent/DE69826644T2/en
Priority to EP20020015320 priority patent/EP1249238A3/en
Priority to CNB031409091A priority patent/CN100379423C/en
Priority to EP02015319A priority patent/EP1250927A3/en
Priority to CA002281755A priority patent/CA2281755C/en
Priority to DK98907038T priority patent/DK0969813T3/en
Priority to AT98907038T priority patent/ATE277596T1/en
Priority to PT98907038T priority patent/PT969813E/en
Priority to AU63024/98A priority patent/AU733047C/en
Priority to PCT/GB1998/000575 priority patent/WO1998036733A2/en
Priority to JP53641998A priority patent/JP3352095B2/en
Priority to CNA031411657A priority patent/CN1480139A/en
Priority to ES98907038T priority patent/ES2224362T3/en
Priority to JP2002159560A priority patent/JP2002356425A/en
Priority to JP2002159559A priority patent/JP2002356422A/en
Priority to US10/214,333 priority patent/US20040028752A1/en
Application filed by SLA Pharma AG filed Critical SLA Pharma AG
Publication of US20040028752A1 publication Critical patent/US20040028752A1/en
Priority to IL178133A priority patent/IL178133A0/en
Assigned to S.L.A. PHARMA AG reassignment S.L.A. PHARMA AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KAMM, MICHAEL A., PHILLIPS, ROBIN K.S.
Priority to US13/178,567 priority patent/US8318721B2/en
Priority to US13/685,023 priority patent/US8906903B2/en
Abandoned legal-status Critical Current

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00Medicinal preparations containing organic active ingredients
    • A61K31/33Heterocyclic compounds
    • A61K31/395Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/55Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having seven-membered rings, e.g. azelastine, pentylenetetrazole
    • A61K31/554Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having seven-membered rings, e.g. azelastine, pentylenetetrazole having at least one nitrogen and one sulfur as ring hetero atoms, e.g. clothiapine, diltiazem
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00Medicinal preparations containing organic active ingredients
    • A61K31/21Esters, e.g. nitroglycerine, selenocyanates
    • A61K31/27Esters, e.g. nitroglycerine, selenocyanates of carbamic or thiocarbamic acids, meprobamate, carbachol, neostigmine
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00Medicinal preparations containing organic active ingredients
    • A61K31/33Heterocyclic compounds
    • A61K31/395Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/55Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having seven-membered rings, e.g. azelastine, pentylenetetrazole
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00Medicinal preparations containing organic active ingredients
    • A61K31/56Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids
    • A61K31/57Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids substituted in position 17 beta by a chain of two carbon atoms, e.g. pregnane or progesterone
    • A61K31/573Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids substituted in position 17 beta by a chain of two carbon atoms, e.g. pregnane or progesterone substituted in position 21, e.g. cortisone, dexamethasone, prednisone or aldosterone
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00Medicinal preparations characterised by special physical form
    • A61K9/0012Galenical forms characterised by the site of application
    • A61K9/0031Rectum, anus
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P1/00Drugs for disorders of the alimentary tract or the digestive system
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P17/00Drugs for dermatological disorders
    • A61P17/02Drugs for dermatological disorders for treating wounds, ulcers, burns, scars, keloids, or the like
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P43/00Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P9/00Drugs for disorders of the cardiovascular system
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P9/00Drugs for disorders of the cardiovascular system
    • A61P9/14Vasoprotectives; Antihaemorrhoidals; Drugs for varicose therapy; Capillary stabilisers
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/06Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
    • A61K47/08Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing oxygen, e.g. ethers, acetals, ketones, quinones, aldehydes, peroxides
    • A61K47/10Alcohols; Phenols; Salts thereof, e.g. glycerol; Polyethylene glycols [PEG]; Poloxamers; PEG/POE alkyl ethers
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/06Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
    • A61K47/08Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing oxygen, e.g. ethers, acetals, ketones, quinones, aldehydes, peroxides
    • A61K47/14Esters of carboxylic acids, e.g. fatty acid monoglycerides, medium-chain triglycerides, parabens or PEG fatty acid esters
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/06Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
    • A61K47/20Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing sulfur, e.g. dimethyl sulfoxide [DMSO], docusate, sodium lauryl sulfate or aminosulfonic acids

Definitions

  • This invention relates to the use of a calcium channel blocker or a cholinegic agent, particularly diltiazem and bethanechol, alone and in combination for the treatment of benign anal diseases where there is an associated anal sphincter spasm.
  • the invention particularly relates to the treatment of anal fissures and painful haemorrhoidal conditions.
  • a fissure is a split in the skin of the distal anal canal. It is a common complaint in young adults with a roughly equal incidence in both sexes. Acute fissures are very common and most heal spontaneously, but a proportion progress to form a chronic linear ulcer in the anal canal and show great reluctance to heal without intervention.
  • Anal dilators have also been involved in treatment. Typically a dilator of medium size was coated with anaesthetic jelly and inserted into the anal canal before the passage of stool to prevent exacerbation of the symptoms during defecation. The procedure was inconvenient and success rate was low. The most common treatment, for chronic anal fissures is a lateral internal sphincterotomy, which involves surgery to the internal anal sphincter. This procedure, however, requires hospitalisation and leads in a sizeable number of patients to impairment of continence (British Journal of Surgery 1996, 83, 1334-1344). As yet there is no proven non-surgical treatment for chronic fissure, although local injection of botulinum A toxin shows early promise (Martindale, The Extra Pharmacopoeia 31st Edition p1516 and 1517).
  • a further potential non-surgical treatment that has recently been reported for anal fissures and haemorrhoids is the topical use of a nitric oxide donor, particularly glyceryl trinitrate. This reduces the internal anal resting pressure (British Journal of Surgery, 1994, 81, 1386-1389 and British Journal of Surgery, 1996, 83, 771-775 both by present inventors; Diseases of the Colon and Rectum, May 1995, p453-457, The New England Journal of Medicine Oct. 26, 1995, p1156 and 1157, WO 95/32715 and its equivalent U.S. Pat. No. 5,504,117—all by Gorfine; British Journal of Surgery 1996, 83, 776-777).
  • Haemorrhoids are venous swellings of the tissues around the anus. Those above the dentate line (the point where the modified skin of the outer anal canal becomes gut epithelium), which usually protrude into the anal canal, are termed internal haemorrhoids, while those below this point are called external haemorrhoids. Due to internal pressure, internal haemorrhoids tend to congest, bleed and eventually prolapse; with external haemorrhoids painful thrombosis may develop.
  • a range of mainly topical drug treatments is available for symptomatic relief, but in many cases their value is a best unproven.
  • Local anaesthetics may be included to relieve pain, and corticosteroids may be used when infection is not present.
  • Preparations containing either group of drugs are intended only for short-term use.
  • Some preparations include heparinoids and other agents frequently included for their soothing properties include various bismuth salts, zinc oxide, hamamelis, resorcinol and peru balsam.
  • Diltiazem is indicated orally for the treatment of angina pectoris and hypertension, and may be given intravenously in the treatment of arterial fibrillation or flutter and paroxysmal supraventricular tachycardia.
  • Bethanechol is used as an alternative to catheterisation in the treatment of urinary retention, gastric atony and retention, abdominal distension following surgery, congenital megacolon, and oesophageal reflux. It is given in doses of 5 mg subcutaneously or 10 to 50 mg by mouth (Martindale, The Extra Pharmacopoeia, 31st Edition, p857 and p1417).
  • anal fissures and haemorrhoids and other benign anal disorders can be treated by local application to the anus of a cholinergic agent or a calcium channel blocker or a mixture thereof.
  • Other benign anal disorders would be those conditions associated with a high anal pressure or where there is an associated anal sphincter spasm.
  • a cholinergic agent or a calcium channel blocker in the preparation of a medicament for local application to the anus for the treatment or prophylaxis of benign anal disorders.
  • a second aspect of the invention provides a composition adapted for local application to the anus comprising at least one of a cholinergic agent or a calcium channel blocker together with a pharmaceutically acceptable carrier.
  • local application to the anus we mean to include local injection into the anal sphincter, and administration in and around the anal canal, preferably by topical application such as spreading a topical composition in and around the anal canal.
  • the cholinergic agents and calcium channel blockers are at least partially effective (and there may be other mechanisms of action) by lowering the anal resting pressure of the patient. This helps the fissures to heal. This reduction in anal pressure should also allow better venous drainage which will allow the haemorroidal vascular cushions to heal.
  • haemorrhoids it is also thought that the cholinergic agents will act to contract the longitudinal muscle of the anus, thereby pulling the haemorrhoidal cushions back into place.
  • anal fissures we mean to include both acute and chronic fissures or ulcers. Any patient with persistent symptoms for more than two weeks is taken to have a chronic fissure in accordance with the invention.
  • haemorrhoids we mean to include both internal and external haemorrhoids and acute thrombosis of external haemorrhoid (TEM).
  • Suitable cholinergic agents in accordance with the invention are selected from a cholinergic agonist of acetylcholine, bethanechol, carbachol, methacholine, and pilocarpine, or an anticholinesterase of ambenonium, neostigmine, physostigmine, pyridostigmine, dyflos, and ecothinopate, and pharmaceutically acceptable salts of thereof.
  • Bethanechol and salts thereof is a particularly preferred cholinergic agent.
  • Suitable calcium channel blockers in accordance with the invention are selected from amlodipine, anipamil, barnidipine, benidipine, bepridil, darodipine, diltiazem, efonidipine, felodipine, isradipine, lacidipine, lercanidipine, lidoflazine, manidipine, mepirodipine, nicardipine, nifedipine, niludipine, nilvadipine, nimodipine, nisoldipine, nitrendipine, perhexiline, tiapamil, verapamil, and pharmaceutically acceptable salts thereof.
  • Diltiazem and salts thereof is a particularly preferred calcium channel blocker.
  • a further preferred aspect of the invention provides a composition for local application to the anus, particularly topically acting composition, but not exclusively for topical application in and around the anal canal comprising diltiazem or bethanechol or a combination thereof or pharmaceutically acceptable salts thereof, together with a pharmaceutically acceptable carrier.
  • diltiazem or bethanechol or a combination thereof and pharmaceutically acceptable salts thereof in the preparation of a topical medicament for the treatment or prophylaxis of benign anal disorders, particularly in the treatment of anal fissures and haemorrhoids.
  • salts of the aforementioned agents include those formed with both organic and inorganic acids.
  • Such acid addition salts will normally be pharmaceutically acceptable although salts of non-pharmaceutically acceptable salts may be of utility in the preparation and purification of the compound in question.
  • preferred salts include those formed from hydrochloric, hydrobromic, sulphuric, citric, tartaric, phosphoric, lactic, pyruvic, acetic, succinic, oxalic, fumaric, maleic, oxaloacetic, methanesulphonic, ethanesulphonic, benzenesulphonic, and isethionic acids.
  • Salts of the compounds of formula (1) can be made by reacting the appropriate compound in the form of the free base with the appropriate acid. Salts of halides are also suitable. Diltiazem hydrochloride, diltiazem malate and diltiazem have CAS registry numbers respectively as follows: 33286-22-5, 144604-00-2, and 42399-41-7. Bethanechol and bethanechol chloride have CAS registry numbers respectively of 674-38-4 and 590-63-6.
  • Diltiazem and bethanechol are of great benefit when topically administered separately, but are of particular benefit and apparently exhibit a synergistic activity when administered together.
  • a suitable proportion of calcium channel blocker, such as diltiazem in a topical or local composition for a beneficial effect is at least 0.5% w/w, such as 0.5% to 10% w/w, preferably 0.5% to 5% w/w, more preferably still 1% to 5% w/w, still more preferably 1% to 3%, and most preferably about 2% w/w.
  • Preliminary dose ranging studies suggest that the maximum effect of the invention is obtained at about 2% and thereafter higher concentrations will not produce a substantial additional effect.
  • the diltiazem composition is suitably applied 3 to 6 times, preferably 3 to 4 times daily, which based on 8 mg per application, gives a total daily dose of 24 mg to 48 mg.
  • a suitable proportion of cholinergic agent, such as bethanechol in a topical or local composition is at least 0.01% w/w, more preferably at least 0.05% such as 0.01% to 3% w/w, preferably 0.01% to 1% w/w, more preferably 0.05% to 1% w/w, and most preferably about 0.1% w/w.
  • Preliminary dose ranging studies suggest that 0.1% w/w produced the maximum effect of the invention, and thereafter higher concentrations will not produce an additional effect.
  • the bethanechol composition is suitably applied in the same periodin as above which based on 0.4 mg per application, gives a total daily dose of 1.2 mg to 2.4 mg.
  • compositions adapted for topical administration in and/or around the anal canal may be formulated as ointments, creams, suspensions, lotions, powders, solutions, pastes, gels, sprays, foam, oils, aerosols, suppositories or enemas.
  • the topical compositions can comprise emulsifiers, preservatives, buffering agents and anti-oxidants.
  • the compositions also comprise steroids (e.g. present at 0.1 to 5% w/w) such as prednisolone, busenonide or hydrocortisone, locally acting anaesthetics such as lignocaine (e.g. at 0.1 to 5% w/w), and soothants.
  • steroids e.g. present at 0.1 to 5% w/w
  • anaesthetics such as lignocaine (e.g. at 0.1 to 5% w/w)
  • lignocaine e.g. at 0.1 to 5% w/w
  • Typical components used in existing fissure or haemorrhoidal treatments which can also be used in topical compositions of the invention include: zinc oxide, benzyl benzoate, bismuth oxide, bismuth subgallate and Peru balsam.
  • the cholinergic agent or calcium channel blocker can be administered in combination with trinitroglycerine or any other nitric oxide donor, isoprenaline, histamine, prostaglandin E 2 , adenosine triphosphate, nictotine, DMPP, bradykinin, caerulein, glucagon, and phentolamine.
  • the topical composition may comprise skin penetrating agents, particularly the sulphoxides, such as dimethyl sulphoxide (DMSO) preferably at 25% to 50% w/w.
  • DMSO dimethyl sulphoxide
  • Amides, (DMA, DMF) pyrrolidones, organic solvents, laurocaprom (AZONE) and calcium thioglycollate are suitable alternative penetrants.
  • the composition may also optionally contains a polyacrylic acid derivative, more particularly a carbomer. This would both act as a skin hydrating agent to aid penetration of the drug, but also an emulsifying agent. The carbomer will help emulsify the DMSO, thereby mitigating skin irritation and providing enhanced skin hydration.
  • Propylene glycol may also be present in the composition to soften the skin, increase thermodynamic potential and aid skin penetration by the DMSO and thus the drug.
  • the final pH of the composition is advantageously pH 3.5 to 4.5.
  • a method for the treatment or prophylaxis of a benign anal disorder comprising local application to the anus or the internal anal sphincter at least one of a cholinergic agent or calcium channel blocker.
  • An anal fissure and haemorroidal topical composition comprising at least one of a cholinergic agent or calcium channel blocker, together with a pharmaceutically acceptable carrier.
  • DMSO cream in the clinical studies may also have a therapeutic effect independent of the bethanechol or diltiazem.
  • a yet further aspect of the invention provides use of DMSO as a therapeutically active agent in the preparation of a topical medicament for the treatment of benign anal disorders, particularly anal fissure or haemorrhoids.
  • the DMSO is present at 25% to 50% w/w, and is advantageously present in combination with propylene glycol, preferably in a ratio by w/w of 5:1 to 15:1.
  • the DMSO composition of this further aspect of the invention is also advantageously present with a polyacrylic acid derivative, such as carbomer, preferably at a ratio by w/w of 20:1 to 80:1.
  • the pH of the composition is pH 3.5 to 4.5.
  • FIG. 1 is a graph of the dose response of diltiazem gel against mean anal resting pressure
  • FIG. 2 is a graph of duration of action of 1% w/w diltiazem gel against mean anal resting pressure
  • FIG. 3 is a graph of the dose response of bethanechol gel against mean anal resting pressure
  • FIG. 4 is a graph of duration of action of 0.1% w/w bethanechol gel against mean anal resting anal pressure
  • FIG. 5 is a graph comparing 2% diltiazem, 0.1% bethanechol, and a combination of both over time against the reduction in mean anal resting pressure.
  • a composition of base gel had the following composition: carmellose sodium 6 g, polyethylene glycol 30 ml, methylhydroxybenzoate 150 mg, propylhydroxybenzoate 15 mg, made up to volume with distilled water (pH6-7).
  • a base cream of the invention had the following composition: Diltiazem hydrochloride (2% w/w) 10 g Dimethyl sulphoxide 250 g Carbomer 974P 5 g White soft paraffin 15 g Cetomacrogel emulsifying ointment* 115 g Propylene glycol 23 g Methylhydroxybenzoate (preservative soln) to 500 g
  • a base cream was formed by firstly separate mixing of the aqueous and non-aqueous components of the cream. Weighed quantities of propylene glycol and a proportion of the preservative solution were placed in a beaker to which the weight quantity of carbomer powder was added using an impeller type mixer to form a colloidal suspension of the carbomer. Thereafter, the weighed quantity of DMSO was added and rapid stirring continued at room temperature until a translucent uniform gel had been formed.
  • the drug is then added to the remainder of the preservative solution , which in turn was then added to the gel and whilst vigorously stirring, the uniform base (above) was added to form a cream.
  • the carbomer acted as a dual neutralisation agent and primary emulsifier (of the oil and aqueous phases) to form the uniform cream base.
  • a bethanechol cream composition was made up as above, but using 0.5 g of bethanechol (0.1% w/w) instead of diltiazem.
  • 2% diltiazem cream from example 2 was applied to the anus three times daily for 8 weeks to treat patients suffering from chronic anal fissures (in an uncontrolled, open, pilot study). To date, 7 patients were studied and followed up between 2 to 5 weeks. 5 patients have had complete resolution of symptoms, of whom 3 have complete and 2 partial healing of the fissure. In four of these 5 patients there has been a reduction of the maximum resting anal sphincter pressure to within normal limits. The last patient, though symptom free, continues to have a high anal resting pressure.
  • the results show that local application to the anus of at least one of a cholinergic agent or calcium channel provides a efficacious treatment for benign anal disorder, particularly anal fissures and haemorrhoids. Furthermore since efficacy can be obtained at surprisingly low doses, the treatment of the invention is also substantially free of side effects normally associated with the active agents.

Abstract

A method and composition are provided for the treatment of an anorectal disorder and for controlling the pain associated therewith. The method comprises administering to a subject in need of such treatment therapeutically effective amounts of a calcium channel blocker either alone or together with a nitric oxide donor. Amlodipine, anipamil, barnidipine, benidipine, bepridil, darodipine, diltiazem, efonidipine, felodipine, isradipine, lacidipine, lercanidipine, lidoflazine, manidipine, mepirodipine, nicardipine, nifedipine, niludipine, nilvadipine, nimodipine, nisoldipine, nitrendipine, perhexiline, tiapamil, verapamil and pharmaceutically acceptable salts thereof, are suitable calcium channel blockers.

Description

  • This invention relates to the use of a calcium channel blocker or a cholinegic agent, particularly diltiazem and bethanechol, alone and in combination for the treatment of benign anal diseases where there is an associated anal sphincter spasm. The invention particularly relates to the treatment of anal fissures and painful haemorrhoidal conditions. [0001]
  • A fissure is a split in the skin of the distal anal canal. It is a common complaint in young adults with a roughly equal incidence in both sexes. Acute fissures are very common and most heal spontaneously, but a proportion progress to form a chronic linear ulcer in the anal canal and show great reluctance to heal without intervention. [0002]
  • Treatment has remained largely unchanged for over 150 years and the pathogenesis of anal fissure is not fully understood. The passage of a hard stool bolus has traditionally been thought to cause anal fissure. Thus for acute fissures the avoidance of constipation, such as involving a high bran diet, has been used as treatment for many years. [0003]
  • Anal dilators have also been involved in treatment. Typically a dilator of medium size was coated with anaesthetic jelly and inserted into the anal canal before the passage of stool to prevent exacerbation of the symptoms during defecation. The procedure was inconvenient and success rate was low. The most common treatment, for chronic anal fissures is a lateral internal sphincterotomy, which involves surgery to the internal anal sphincter. This procedure, however, requires hospitalisation and leads in a sizeable number of patients to impairment of continence (British Journal of Surgery 1996, 83, 1334-1344). As yet there is no proven non-surgical treatment for chronic fissure, although local injection of botulinum A toxin shows early promise (Martindale, The Extra Pharmacopoeia 31st Edition p1516 and 1517). [0004]
  • A further potential non-surgical treatment that has recently been reported for anal fissures and haemorrhoids is the topical use of a nitric oxide donor, particularly glyceryl trinitrate. This reduces the internal anal resting pressure (British Journal of Surgery, 1994, 81, 1386-1389 and British Journal of Surgery, 1996, 83, 771-775 both by present inventors; Diseases of the Colon and Rectum, May 1995, p453-457, The New England Journal of Medicine Oct. 26, 1995, p1156 and 1157, WO 95/32715 and its equivalent U.S. Pat. No. 5,504,117—all by Gorfine; British Journal of Surgery 1996, 83, 776-777). [0005]
  • At a meeting of the Royal Society of Medicine Coloproctology Session on Nov. 27, 1996, a paper entitled “The effect of alpha adrenoceptor blockade on the anal canal in patients with chronic anal fissure” was presented showing that indoramin reduced maximum resting pressures in the anal canal after 1 hour by 35.8% in patients with anal fissures. The author suggested a clinical trial to determine the efficacy of indoramin in the treatment of anal fissures. [0006]
  • In Dis Colon Rectum, February 1996, [0007] vol 2, no.2, p212-216 nifedipine was reported as reducing the activity of the internal anal sphincter in patients with high anal resting pressure, and was proposed for use in relieving symptoms in patients with haemorrhoids or anal fissures.
  • Haemorrhoids (‘piles’) are venous swellings of the tissues around the anus. Those above the dentate line (the point where the modified skin of the outer anal canal becomes gut epithelium), which usually protrude into the anal canal, are termed internal haemorrhoids, while those below this point are called external haemorrhoids. Due to internal pressure, internal haemorrhoids tend to congest, bleed and eventually prolapse; with external haemorrhoids painful thrombosis may develop. [0008]
  • Initial treatment of internal haemorrhoids involves a high-fibre diet and avoidance of straining at stool, so bulk laxatives and faecal softeners may be indicated. Small bleeding haemorrhoids may be injected with a sclerosing agent such as oily phenol injection, or they may be ligated with rubber bands. More severe and prolonged prolapse generally requires surgery. Surgical excision to remove the clot is used for thrombosed external haemorrhoids. [0009]
  • A range of mainly topical drug treatments is available for symptomatic relief, but in many cases their value is a best unproven. Local anaesthetics may be included to relieve pain, and corticosteroids may be used when infection is not present. Preparations containing either group of drugs are intended only for short-term use. Some preparations include heparinoids and other agents frequently included for their soothing properties include various bismuth salts, zinc oxide, hamamelis, resorcinol and peru balsam. [0010]
  • In British Journal of Surgery 1994, 81, 946-954, Loder et al reviewed the possible pathology, pathophysiology and aetiology of haemorrhoids but came to no firm conclusions. The authors speculate that the anal cushions surround the anal canal act as a seal to prevent minor leakage from the anus and these cushions distend as a consequence of haemorrhoidal disease. The authors also explored whether haemorrhoids is more prevalent in certain racial groups, whether it is a function of diet, habits or body habitus, whether it is a genetic disorder or whether it is associated with other conditions such as hernia. No firm conclusions were, however, reached as to the aetiology of haemorrhoids or how to treat it effectively. [0011]
  • Diltiazem is indicated orally for the treatment of angina pectoris and hypertension, and may be given intravenously in the treatment of arterial fibrillation or flutter and paroxysmal supraventricular tachycardia. Bethanechol is used as an alternative to catheterisation in the treatment of urinary retention, gastric atony and retention, abdominal distension following surgery, congenital megacolon, and oesophageal reflux. It is given in doses of 5 mg subcutaneously or 10 to 50 mg by mouth (Martindale, The Extra Pharmacopoeia, 31st Edition, p857 and p1417). [0012]
  • In a letter to the Lancet Jun. 28, 1986 at p1493 and Mar. 28, 1987 at p754 diltiazem given orally at 60 mg was found to reduce internal anal resting pressure and to treat proctalgia fugax. There was, however, no suggestion of diltiazem being used to treat anal fissure or haemorrhoids. [0013]
  • It is an object of the present invention to provide a non-surgical treatment for anal fissures and/or haemorrhoids, or other benign anal disorders. [0014]
  • The inventors have now found that anal fissures and haemorrhoids and other benign anal disorders can be treated by local application to the anus of a cholinergic agent or a calcium channel blocker or a mixture thereof. Other benign anal disorders would be those conditions associated with a high anal pressure or where there is an associated anal sphincter spasm. [0015]
  • Accordingly in a first aspect of the invention, there is provided use of at least one of a cholinergic agent or a calcium channel blocker in the preparation of a medicament for local application to the anus for the treatment or prophylaxis of benign anal disorders. [0016]
  • To the inventors knowledge the active agents are usually administerd orally or intraveneously and have never before been contemplated in topical form. Accordingly, a second aspect of the invention provides a composition adapted for local application to the anus comprising at least one of a cholinergic agent or a calcium channel blocker together with a pharmaceutically acceptable carrier. [0017]
  • By local application to the anus we mean to include local injection into the anal sphincter, and administration in and around the anal canal, preferably by topical application such as spreading a topical composition in and around the anal canal. [0018]
  • Without being bound by theory, it is believed that the cholinergic agents and calcium channel blockers are at least partially effective (and there may be other mechanisms of action) by lowering the anal resting pressure of the patient. This helps the fissures to heal. This reduction in anal pressure should also allow better venous drainage which will allow the haemorroidal vascular cushions to heal. [0019]
  • In the case of haemorrhoids, it is also thought that the cholinergic agents will act to contract the longitudinal muscle of the anus, thereby pulling the haemorrhoidal cushions back into place. [0020]
  • In any case the clinical results to date suggest the inventors have made a major advance in the field by providing a safe and efficacious non-surgical treatment for anal fissures and haemorrhoids. [0021]
  • By anal fissures we mean to include both acute and chronic fissures or ulcers. Any patient with persistent symptoms for more than two weeks is taken to have a chronic fissure in accordance with the invention. [0022]
  • By haemorrhoids we mean to include both internal and external haemorrhoids and acute thrombosis of external haemorrhoid (TEM). [0023]
  • Suitable cholinergic agents in accordance with the invention are selected from a cholinergic agonist of acetylcholine, bethanechol, carbachol, methacholine, and pilocarpine, or an anticholinesterase of ambenonium, neostigmine, physostigmine, pyridostigmine, dyflos, and ecothinopate, and pharmaceutically acceptable salts of thereof. [0024]
  • Bethanechol and salts thereof is a particularly preferred cholinergic agent. [0025]
  • Suitable calcium channel blockers in accordance with the invention are selected from amlodipine, anipamil, barnidipine, benidipine, bepridil, darodipine, diltiazem, efonidipine, felodipine, isradipine, lacidipine, lercanidipine, lidoflazine, manidipine, mepirodipine, nicardipine, nifedipine, niludipine, nilvadipine, nimodipine, nisoldipine, nitrendipine, perhexiline, tiapamil, verapamil, and pharmaceutically acceptable salts thereof. [0026]
  • Diltiazem and salts thereof is a particularly preferred calcium channel blocker. [0027]
  • A further preferred aspect of the invention provides a composition for local application to the anus, particularly topically acting composition, but not exclusively for topical application in and around the anal canal comprising diltiazem or bethanechol or a combination thereof or pharmaceutically acceptable salts thereof, together with a pharmaceutically acceptable carrier. [0028]
  • Accordingly in a preferred aspect of the invention there is provided the use of diltiazem or bethanechol or a combination thereof and pharmaceutically acceptable salts thereof in the preparation of a topical medicament for the treatment or prophylaxis of benign anal disorders, particularly in the treatment of anal fissures and haemorrhoids. [0029]
  • Pharmaceutically acceptable salts of the aforementioned agents, such as of diltiazem and bethanechol, include those formed with both organic and inorganic acids. Such acid addition salts will normally be pharmaceutically acceptable although salts of non-pharmaceutically acceptable salts may be of utility in the preparation and purification of the compound in question. Thus, preferred salts include those formed from hydrochloric, hydrobromic, sulphuric, citric, tartaric, phosphoric, lactic, pyruvic, acetic, succinic, oxalic, fumaric, maleic, oxaloacetic, methanesulphonic, ethanesulphonic, benzenesulphonic, and isethionic acids. Salts of the compounds of formula (1) can be made by reacting the appropriate compound in the form of the free base with the appropriate acid. Salts of halides are also suitable. Diltiazem hydrochloride, diltiazem malate and diltiazem have CAS registry numbers respectively as follows: 33286-22-5, 144604-00-2, and 42399-41-7. Bethanechol and bethanechol chloride have CAS registry numbers respectively of 674-38-4 and 590-63-6. [0030]
  • Diltiazem and bethanechol are of great benefit when topically administered separately, but are of particular benefit and apparently exhibit a synergistic activity when administered together. [0031]
  • A suitable proportion of calcium channel blocker, such as diltiazem in a topical or local composition for a beneficial effect is at least 0.5% w/w, such as 0.5% to 10% w/w, preferably 0.5% to 5% w/w, more preferably still 1% to 5% w/w, still more preferably 1% to 3%, and most preferably about 2% w/w. Preliminary dose ranging studies suggest that the maximum effect of the invention is obtained at about 2% and thereafter higher concentrations will not produce a substantial additional effect. [0032]
  • The diltiazem composition is suitably applied 3 to 6 times, preferably 3 to 4 times daily, which based on 8 mg per application, gives a total daily dose of 24 mg to 48 mg. [0033]
  • A suitable proportion of cholinergic agent, such as bethanechol in a topical or local composition is at least 0.01% w/w, more preferably at least 0.05% such as 0.01% to 3% w/w, preferably 0.01% to 1% w/w, more preferably 0.05% to 1% w/w, and most preferably about 0.1% w/w. Preliminary dose ranging studies suggest that 0.1% w/w produced the maximum effect of the invention, and thereafter higher concentrations will not produce an additional effect. [0034]
  • The bethanechol composition is suitably applied in the same regimin as above which based on 0.4 mg per application, gives a total daily dose of 1.2 mg to 2.4 mg. [0035]
  • Pharmaceutical compositions adapted for topical administration in and/or around the anal canal may be formulated as ointments, creams, suspensions, lotions, powders, solutions, pastes, gels, sprays, foam, oils, aerosols, suppositories or enemas. [0036]
  • The topical compositions can comprise emulsifiers, preservatives, buffering agents and anti-oxidants. Preferably the compositions also comprise steroids (e.g. present at 0.1 to 5% w/w) such as prednisolone, busenonide or hydrocortisone, locally acting anaesthetics such as lignocaine (e.g. at 0.1 to 5% w/w), and soothants. Typical components used in existing fissure or haemorrhoidal treatments which can also be used in topical compositions of the invention include: zinc oxide, benzyl benzoate, bismuth oxide, bismuth subgallate and Peru balsam. [0037]
  • In accordance with the invention, the cholinergic agent or calcium channel blocker can be administered in combination with trinitroglycerine or any other nitric oxide donor, isoprenaline, histamine, prostaglandin E[0038] 2, adenosine triphosphate, nictotine, DMPP, bradykinin, caerulein, glucagon, and phentolamine.
  • The topical composition may comprise skin penetrating agents, particularly the sulphoxides, such as dimethyl sulphoxide (DMSO) preferably at 25% to 50% w/w. Amides, (DMA, DMF) pyrrolidones, organic solvents, laurocaprom (AZONE) and calcium thioglycollate are suitable alternative penetrants. The composition may also optionally contains a polyacrylic acid derivative, more particularly a carbomer. This would both act as a skin hydrating agent to aid penetration of the drug, but also an emulsifying agent. The carbomer will help emulsify the DMSO, thereby mitigating skin irritation and providing enhanced skin hydration. Propylene glycol may also be present in the composition to soften the skin, increase thermodynamic potential and aid skin penetration by the DMSO and thus the drug. The final pH of the composition is advantageously pH 3.5 to 4.5. [0039]
  • Further aspects of the invention are as follows: [0040]
  • A. A method for the treatment or prophylaxis of a benign anal disorder comprising local application to the anus or the internal anal sphincter at least one of a cholinergic agent or calcium channel blocker. [0041]
  • B. An anal fissure and haemorroidal topical composition comprising at least one of a cholinergic agent or calcium channel blocker, together with a pharmaceutically acceptable carrier. [0042]
  • Early investigations suggest that the DMSO cream in the clinical studies may also have a therapeutic effect independent of the bethanechol or diltiazem. Thus a yet further aspect of the invention provides use of DMSO as a therapeutically active agent in the preparation of a topical medicament for the treatment of benign anal disorders, particularly anal fissure or haemorrhoids. [0043]
  • Preferably the DMSO is present at 25% to 50% w/w, and is advantageously present in combination with propylene glycol, preferably in a ratio by w/w of 5:1 to 15:1. The DMSO composition of this further aspect of the invention is also advantageously present with a polyacrylic acid derivative, such as carbomer, preferably at a ratio by w/w of 20:1 to 80:1. Preferably the pH of the composition is pH 3.5 to 4.5.[0044]
  • The invention will now be described by way of example only with reference to the accompanying drawings, in which: [0045]
  • FIG. 1 is a graph of the dose response of diltiazem gel against mean anal resting pressure; [0046]
  • FIG. 2 is a graph of duration of action of 1% w/w diltiazem gel against mean anal resting pressure; [0047]
  • FIG. 3 is a graph of the dose response of bethanechol gel against mean anal resting pressure; [0048]
  • FIG. 4 is a graph of duration of action of 0.1% w/w bethanechol gel against mean anal resting anal pressure; and [0049]
  • FIG. 5 is a graph comparing 2% diltiazem, 0.1% bethanechol, and a combination of both over time against the reduction in mean anal resting pressure.[0050]
  • EXAMPLE 1
  • A composition of base gel had the following composition: carmellose sodium 6 g, polyethylene glycol 30 ml, methylhydroxybenzoate 150 mg, propylhydroxybenzoate 15 mg, made up to volume with distilled water (pH6-7). [0051]
  • Various amounts of diltiazem and bethanechol were added in the amounts shown in examples 4 and 6 to form various compositions for dose ranging studies. [0052]
  • EXAMPLE 2
  • A base cream of the invention had the following composition: [0053]
    Diltiazem hydrochloride (2% w/w) 10 g
    Dimethyl sulphoxide 250 g
    Carbomer 974P 5 g
    White soft paraffin 15 g
    Cetomacrogel emulsifying ointment* 115 g
    Propylene glycol 23 g
    Methylhydroxybenzoate (preservative soln) to 500 g
  • A base cream was formed by firstly separate mixing of the aqueous and non-aqueous components of the cream. Weighed quantities of propylene glycol and a proportion of the preservative solution were placed in a beaker to which the weight quantity of carbomer powder was added using an impeller type mixer to form a colloidal suspension of the carbomer. Thereafter, the weighed quantity of DMSO was added and rapid stirring continued at room temperature until a translucent uniform gel had been formed. [0054]
  • In the meantime, the weighed quantities of white soft paraffin and the cetamacrogol emulsifying ointment were placed in a separate beaker, heated to melting point and gently stirred to give a uniform base. [0055]
  • The drug is then added to the remainder of the preservative solution , which in turn was then added to the gel and whilst vigorously stirring, the uniform base (above) was added to form a cream. The carbomer acted as a dual neutralisation agent and primary emulsifier (of the oil and aqueous phases) to form the uniform cream base. [0056]
  • EXAMPLE 3
  • A bethanechol cream composition was made up as above, but using 0.5 g of bethanechol (0.1% w/w) instead of diltiazem. [0057]
  • EXAMPLE 4 Diltiazem Cream and Tablet—Dose Ranging Study on Healthy Volunteers
  • Ten volunteers were used in a double blind study to determine the concentration of diltiazem cream (of example 1) which most effectively lowers resting anal sphincter pressure as measured by an eight channel water perfused manometer. Concentrations of diltiazem cream used were 0.1%, 0.5%, 1%, 2%, 5% and 10%. Results showed a dose dependent reduction of the resting anal sphincter pressure. The maximal effect, at which the mean resting anal pressure was lowered by 28% (P<0.0001), was produced by 2% w/w cream (See FIG. 1). Higher concentrations did not produce an additional effect. A typical ‘one inch’ application of the cream from the tube is equivalent to 8 mg dose of diltiazem. Measurements taken throughout the day showed the effect of a single application to be sustained for 3 to 5 hours (see FIG. 2). [0058]
  • EXAMPLE 5 Open Study of Diltiazem Cream in Patients with Anal Fissures
  • 2% diltiazem cream from example 2 was applied to the anus three times daily for 8 weeks to treat patients suffering from chronic anal fissures (in an uncontrolled, open, pilot study). To date, 7 patients were studied and followed up between 2 to 5 weeks. 5 patients have had complete resolution of symptoms, of whom 3 have complete and 2 partial healing of the fissure. In four of these 5 patients there has been a reduction of the maximum resting anal sphincter pressure to within normal limits. The last patient, though symptom free, continues to have a high anal resting pressure. [0059]
  • 2 patients have only had two weeks of treatment and one is symptom free after this short period, whilst the other still has occasional pain. It is too early to comment on healing of fissures in these two patients. [0060]
  • EXAMPLE 6 Bethanechol Cream—Dose Ranging Study in Healthy Volunteers
  • Ten volunteers were used in a double blind study to determine the concentration of bethanechol gel which most effectively lowered resting anal sphincter pressure. [0061]
  • Bethanechol cream at concentrations of 0.05%, 0.1%, 0.5% and 1% w/w bethanechol were made up in accordance with example 1. The compositions were studied following initial experimentation in an open way to determine a clinically effective dose range. Results showed a dose dependent reduction in the resting anal sphincter pressure (see FIG. 3). Maximal effect was produced by application of 0.1% bethanechol and higher concentrations of the cream produced no additional effect. At 0.1% w/w bethanechol, the mean resting pressure was reduced from about 110 cm to about 85 cm H[0062] 2O (about 25% decrease). A typical ‘one inch’ application of this cream from the tube is equivalent to 400 mcg of bethanechol. Measurements taken throughout the day showed the effect of a single application to be sustained from 3 to 5 hours (see FIG. 4).
  • EXAMPLE 7 Open Study of Bethanechol Cream in Patients with Chronic Anal Fissures
  • The 0.1% bethanechol cream of example 3 was applied to the anus three times daily for an eight week course to treat patients suffering from chronic anal fissures (in an uncontrolled, open, pilot study). To date, 6 patients have been treated and followed up for 3 to 5 weeks. Four patients have had complete resolution of symptoms, of whom 3 have complete and 1 partial healing of the fissure. In all of these 4 patients there has been a reduction of the maximum resting anal sphincter pressure to within normal limits. One patient discovered she was pregnant and treatment was discontinued. The last patient has had no relief and remains symptomatic after 4 weeks' follow up. [0063]
  • These results shows that both bethanechol and diltiazem (applied topically) reduce the resting anal sphincter pressure in healthy and diseased patients. The preliminary open studies, albeit in a small group of patients, has shown a significant healing rate and symptom relief after only a few weeks application of both agents. This is a major achievement for the non-surgical treatment of fissures and offers hope to its many sufferers. [0064]
  • When the study of example 4 was repeated using 60 mg oral diltiazem once a day, no notable effect was obtained. At 60 mg twice a day, the mean anal resting pressure was reduced by 17% (P=0.008), but two patients notices postural dizziness. Topical diltiazem is surprisingly safer and more effective than oral diltiazem. [0065]
  • EXAMPLE 8
  • In a combined bethanechol and diltiazem study, six healthy volunteers had topically applied to their anus on different days: [0066]
  • 1) diltiazem at 2% w/w alone; [0067]
  • 2) bethanechol at 0.1% w/w alone; and [0068]
  • 3) diltiazem and bethanechol combined. [0069]
  • Anal mamometry was carried out before and after each of the three creams were applied and repeated at two hourly intervals. The mean results are shown in FIG. 5. [0070]
  • These show that the combination of diltiazem and bethanechol gives a larger reduction in the mean anal resting pressure than either of diltiazem or bethanechol alone. This synergy may be due to both agents working in different mechanistic pathways to effect the pressure drop. [0071]
  • In summary, the results show that local application to the anus of at least one of a cholinergic agent or calcium channel provides a efficacious treatment for benign anal disorder, particularly anal fissures and haemorrhoids. Furthermore since efficacy can be obtained at surprisingly low doses, the treatment of the invention is also substantially free of side effects normally associated with the active agents. [0072]

Claims (55)

What is claimed is:
1. A method of treating an anorectal disorder, and for controlling the pain associated therewith, the method comprising administering to a subject in need of such treatment a therapeutically effective amount of a calcium channel blocker either alone or together with a nitric oxide donor.
2. A method in accordance with claim 1, wherein both the calcium channel blocker and nitric oxide donor are administered.
3. A method in accordance with claim 2, wherein said nitric oxide donor and said calcium channel blocker are administered in combination.
4. A method in accordance with claim 1, wherein said anorectal disorder is an anal fissure.
5. A method in accordance with any one of claims 1, 2, 3 or 4, wherein said administration is topical.
6. A method in accordance with claim 5, wherein said administration is in the form of a gel, ointment, cream, emollient, lotion, powder, solution, suspension, spray, paste, oil, foam, suppository or enema.
7. A method in accordance with claim 6, wherein said calcium channel blocker is administered in an amount within the range of from 0.5% to 5% w/w.
8. A method of treating a benign anal disorder, the method comprising administering to a subject in need of such treatment a therapeutically effective amount of a calcium channel blocker either alone or together with a nitric oxide donor.
9. A method in accordance with claim 8, wherein both the calcium channel blocker and nitric oxide donor are administered.
10. A method in accordance with claim 9, wherein said nitric oxide donor and calcium channel blocker are administered in combination.
11. A method in accordance with claim 8, wherein said anorectal disorder is an anal fissure.
12. A method in accordance with any one of claims 8, 9, 10 or 11, wherein said administration is topical.
13. A method in accordance with claim 12, wherein said administration is in the form of a gel, ointment, cream, emollient, lotion, powder, solution, suspension, spray, paste, oil, foam, suppository or enema.
14. A method in accordance with claim 13, wherein said calcium channel blocker is administered in an amount within the range of from 0.5% to 5% w/w.
15. A method of treating an anorectal disorder, and for controlling the pain associated therewith, the method comprising administering to a subject in need of such treatment a therapeutically effective amount of an agent selected from the group consisting of diltiazem, nifedipine and pharmaceutically acceptable salts thereof either alone or together with a nitric oxide donor.
16. A method in accordance with claim 15, wherein both said agent and the nitric oxide donor are administered.
17. A method in accordance with claim 16, wherein said agent and said nitric oxide donor are administered in combination.
18. A method in accordance with claim 15, wherein said anorectal disorder is an anal fissure.
19. A method in accordance with any one of claims 15, 16, 17 or 18, wherein said administration is topical.
20. A method in accordance with claim 19, wherein said administration is in the form of a gel, ointment, cream, emollient, lotion, powder, solution, suspension, spray, paste, oil, foam, suppository or enema.
21. A method in accordance with claim 20, wherein said calcium channel blocker is administered in an amount within the range of from 0.5% to 5% w/w.
22. A method of treating a benign anal disorder, the method comprising administering to a subject in need of such treatment a therapeutically effective amount of an agent selected from the group consisting of diltiazem, nifedipine and pharmaceutically acceptable salts thereof either alone or together with a nitric oxide donor.
23. A method in accordance with claim 22, wherein both said agent and said nitric oxide donor are administered.
24. A method in accordance with claim 23, wherein said agent and said nitric oxide donor are administered in combination.
25. A method in accordance with claim 22, wherein said anorectal disorder is an anal fissure.
26. A method in accordance with any one of claims 22, 23, 24 or 25, wherein said administration is topical.
27. A method in accordance with claim 26, wherein said administration is in the form of a gel, ointment, cream, emollient, lotion, powder, solution, suspension, spray, paste, oil, foam, suppository or enema.
28. A method in accordance with claim 27, wherein said calcium channel blocker is administered in an amount within the range of from 0.5% to 5% w/w.
29. A method of treating an anorectal disorder, and for controlling the pain associated therewith, the method comprising administering to a subject in need of such treatment a therapeutically effective amount of a composition comprising a pharmaceutically acceptable carrier and an agent which increases a level of cyclic guanidine monophosphate or cyclic adenosine monophosphate in a tissue of an anal sphincter muscle of the subject, thereby decreasing hypertonicity of the anal sphincter muscle of the subject, which composition comprises a calcium channel blocker either alone or together with a nitric oxide donor.
30. A method according to claim 29, wherein both said calcium channel blocker and said nitric oxide donor are administered.
31. A method for the treatment or prophylaxis of benign anal disorders comprising local application to the anus of a patient a therapeutically effective amount of a calcium channel blocker either alone or in combination with a nitric oxide donor.
32. A method in accordance with claim 31, wherein both said calcium oxide blocker and said nitric oxide donor are administered.
33. A method in accordance with claim 32, wherein said calcium oxide blocker and said nitric oxide donor are administered in combination.
34. A method in accordance with claim 31, wherein said administration is in the form of a gel, ointment, cream, emollient, lotion, powder, solution, suspension, spray, paste, oil, foam, suppository or enema.
35. A method in accordance with claim 34, wherein said calcium channel blocker is administered in an amount within the range of from 0.5% to 5% w/w.
36. A method for the treatment or prophylaxis of benign anal disorders associated with high anal pressure or anal sphincter spasm, comprising local application to the anus of a patient a therapeutically effective amount of a calcium channel blocker either alone or in combination with a nitric oxide donor.
37. A method in accordance with claim 36, wherein both said calcium oxide blocker and said nitric oxide donor are administered.
38. A method in accordance with claim 37, wherein said calcium oxide blocker and said nitric oxide donor are administered in combination.
39. A method in accordance with claim 36, wherein said administration is in the form of a gel, ointment, cream, emollient, lotion, powder, solution, suspension, spray, paste, oil, foam, suppository or enema.
40. A method in accordance with claim 39, wherein said calcium channel blocker is administered in an amount within the range of from 0.5% to 5% w/w.
41. A method for the treatment or prophylaxis of benign anal disorders associated with high anal pressure or anal sphincter spasm, and the relief of symptoms associated therewith, comprising local application to the internal anal sphincter of a patient a therapeutically effective amount of a calcium channel blocker either alone or together with a nitric oxide donor.
42. A method in accordance with claim 41, wherein both said calcium oxide blocker and said nitric oxide donor are administered.
43. A method in accordance with claim 42, wherein said calcium oxide blocker and said nitric oxide donor are administered in combination.
44. A method according to any one of claims 1, 8,15, 29, 31, 36 or 41, wherein the calcium channel blocker is selected from the group consisting of amlodipine, anipamil, barnidipine, benidipine, bepridil, darodipine, diltiazem, efonidipine, felodipine, isradipine, lacidipine, lercanidipine, lidoflazine, manidipine, mepirodipine, nicardipine, nifedipine, niludipine, nilvadipine, nimodipine, nisoldipine, nitrendipine, perhexiline, tiapamil, verapamil, and pharmaceutically acceptable salts thereof.
45. A method according to any one of claims 1, 8, 15, 22, 29, 31, 36 or 41, wherein the nitric oxide donor is trinitroglycerine.
46. A method according to any one of claims 1, 8, 15, 22, 29, 31, 36 or 41, wherein the anal disorder is hemorrhoids.
47. A method in accordance with claim 41, wherein said administration is in the form of a gel, ointment, cream, emollient, lotion, powder, solution, suspension, spray, paste, oil, foam, suppository or enema.
48. A method in accordance with claim 47, wherein said calcium channel blocker is administered in an amount within the range of from 0.5% to 5% w/w.
49. A composition adapted for topical application in and around the anal canal comprising a calcium channel blocker and a nitric oxide donor together with a pharmaceutically acceptable carrier.
50. A composition according to claim 49, wherein the calcium channel blocker is selected from the group consisting of amlodipine, anipamil, barnidipine, benidipine, bepridil, darodipine, diltiazem, efonidipine, felodipine, isradipine, lacidipine, lercanidipine, lidoflazine, manidipine, mepirodipine, nicardipine, nifedipine, niludipine, nilvadipine, nimodipine, nisoldipine, nitrendipine, perhexiline, tiapamil, verapamil, and pharmaceutically acceptable salts thereof.
51. A composition according to claim 50, wherein the calcium channel blocker is selected from the group consisting of diltiazem, nifedipine and pharmaceutically acceptable salts thereof.
52. A composition according to claim 49, wherein the nitric oxide donor is trinitroglycerine or a pharmaceutically acceptable salt thereof.
53. A composition according to claim 51, wherein said calcium channel blocker is diltiazem.
54. A method in accordance with claim 49, wherein said composition is in the form of a gel, ointment, cream, emollient, lotion, powder, solution, suspension, spray, paste, oil, foam, suppository or enema.
55. A method in accordance with claim 49, wherein said calcium channel blocker is present in an amount within the range of from 0.5% to 5% w/w.
US10/214,333 1997-02-24 2002-08-08 Topical pharmaceutical composition comprising a cholinergic agent or a calcium channel blocker Abandoned US20040028752A1 (en)

Priority Applications (24)

Application Number Priority Date Filing Date Title
GBGB9703750.1A GB9703750D0 (en) 1997-02-24 1997-02-24 Treatment of haemorrhoids
GBGB9727238.9A GB9727238D0 (en) 1997-12-23 1997-12-23 Pharmaceutical composition
AT98907038T ATE277596T1 (en) 1997-02-24 1998-02-23 TOPICAL PHARMACEUTICAL COMPOSITION CONTAINING A CHOLINERGIC ACT OR A CALCIUM CHANNEL BLOCKER
CNA031411657A CN1480139A (en) 1997-02-24 1998-02-23 Local medical compsn contg cholinergic medicine or calcium passage retardant
ES98907038T ES2224362T3 (en) 1997-02-24 1998-02-23 TOPICA PHARMACEUTICAL COMPOSITION INCLUDING A COLINERGIC AGENT OR A CALCIUM CHANNEL BLOCKER
JP53641998A JP3352095B2 (en) 1997-02-24 1998-02-23 Topical pharmaceutical compositions containing cholinergic agents or calcium channel blockers
CN98802787A CN1127333C (en) 1997-02-24 1998-02-23 Topical pharmaceutical composition comprising cholinergic agent or calcium channel blocker
DE69826644T DE69826644T2 (en) 1997-02-24 1998-02-23 TOPICAL PHARMACEUTICAL COMPOSITION CONTAINING A CHOLINERGIC ACTIVE OR A CALCIUM CHANNEL BLOCKER
EP20020015320 EP1249238A3 (en) 1997-02-24 1998-02-23 Topical pharmaceutical composition comprising bethanechol
CNB031409091A CN100379423C (en) 1997-02-24 1998-02-23 Topical medicine composite containing cholinergic drug or calcium channel paralyser
EP02015319A EP1250927A3 (en) 1997-02-24 1998-02-23 Pharmaceutical composition for topical application comprising nifedipine
CA002281755A CA2281755C (en) 1997-02-24 1998-02-23 Topical pharmaceutical composition comprising a cholinergic agent or a calcium channel blocker
DK98907038T DK0969813T3 (en) 1997-02-24 1998-02-23 Topical pharmaceutical composition comprising a cholinergic or calcium channel blocking agent
IL13147798A IL131477A0 (en) 1997-02-24 1998-02-23 Topical pharmaceutical composition comprising a cholinergic agent or a calcium channel blocker
PT98907038T PT969813E (en) 1997-02-24 1998-02-23 TOPICAL PHARMACEUTICAL COMPOSITION UNDERSTANDING A COLINERGIC AGENT OR A CALCIUM CHANNEL BLOCKER
AU63024/98A AU733047C (en) 1997-02-24 1998-02-23 Pharmaceutical composition
PCT/GB1998/000575 WO1998036733A2 (en) 1997-02-24 1998-02-23 Topical pharmaceutical composition comprising a cholinergic agent or a calcium channel blocker
EP98907038A EP0969813B1 (en) 1997-02-24 1998-02-23 Topical pharmaceutical composition comprising a cholinergic agent or a calcium channel blocker
JP2002159559A JP2002356422A (en) 1997-02-24 2002-05-31 Topical medicinal composition containing bethanechol
JP2002159560A JP2002356425A (en) 1997-02-24 2002-05-31 Topical medicinal composition containing single nifedipine or selective combination thereof with bethanechol
US10/214,333 US20040028752A1 (en) 1997-02-24 2002-08-08 Topical pharmaceutical composition comprising a cholinergic agent or a calcium channel blocker
IL178133A IL178133A0 (en) 1997-02-24 2006-09-17 Topical pharmaceutical composition comprising a cholinergic agent or a calcium channel blocker
US13/178,567 US8318721B2 (en) 1997-02-24 2011-07-08 Topical pharmaceutical composition comprising a cholinergic agent or a calcium channel blocker
US13/685,023 US8906903B2 (en) 1997-02-24 2012-11-26 Topical pharmaceutical composition comprising a cholinergic agent or a calcium channel blocker

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GBGB9703750.1A GB9703750D0 (en) 1997-02-24 1997-02-24 Treatment of haemorrhoids
GBGB9727238.9A GB9727238D0 (en) 1997-12-23 1997-12-23 Pharmaceutical composition
US10/214,333 US20040028752A1 (en) 1997-02-24 2002-08-08 Topical pharmaceutical composition comprising a cholinergic agent or a calcium channel blocker

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PT969813E (en) 2004-12-31
US20110263568A1 (en) 2011-10-27
CN1248162A (en) 2000-03-22
US20130079332A1 (en) 2013-03-28
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JP2002356422A (en) 2002-12-13
AU733047B2 (en) 2001-05-03
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EP1250927A2 (en) 2002-10-23
DK0969813T3 (en) 2005-01-31
WO1998036733A3 (en) 1998-11-26
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US8318721B2 (en) 2012-11-27
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EP1250927A3 (en) 2003-03-26
WO1998036733A2 (en) 1998-08-27
AU6302498A (en) 1998-09-09
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JP2002356425A (en) 2002-12-13
EP0969813A2 (en) 2000-01-12
CN100379423C (en) 2008-04-09
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EP1249238A3 (en) 2003-03-26
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IL131477A0 (en) 2001-01-28
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