AU2002228045A1 - Use of 2-amino-1(4-hydroxy-2-methanesulphonamidophenyl)ethanol for treating urinary incontinence - Google Patents

Description

Use of 2-amino-1-(4-hydroxy-2-methanesulphonamidophenyl)ethanol for treating urinary incontinence

The present invention relates to medicaments containing 2-amino-1-(4-hydroxy-2- methanesulphonamidophenyl)ethanol, one of the two optical isomers thereof and/or the pharmacologically acceptable salts thereof, particularly for treating urinary incontinence.

The compound according to the invention has the following structure: Formula I:

Prior art:

By incontinence is meant an involuntary release of urine, i.e. weakness of the bladder. The various manifestations of urinary incontinence include urge incontinence, reflex incontinence, overflow incontinence and stress incontinence. The most common form of urinary incontinence is stress incontinence. This affects Women, in particular, after more or less difficult childbirth. The reason for this is that pregnancy and labour easily lead to a weakening of the pelvic floor. Other causes of incontinence may lie, for example, in damage to the nerves of the pelvic floor, a congenitally short urethra or damage to the sphincter muscle.

According to WO 96/32939 it is beneficial to use alpha-1 L-agonists in the treatment of urinary incontinence, as they act selectively on the adrenoreceptors of the bladder and thus have a crucial effect on the tonicity of the urethra, without significantly affecting the cardiac circulatory system. EP 0 538 469 describes 2-amino-1-(2-fluoro-5-methanesulphonamido- phenyl)ethanol and the use thereof for treating urinary incontinence.

Description of the invention Surprisingly, it has now been found that the compound of formula I has an outstanding agonistic effect on alpha-1 L-receptors. The substance acts highly selectively on the bladder and inhibits urinary urgency.

The aim is therefore to develop a medicament with which urinary incontinence can be treated in a controlled manner.

A further objective is to develop medicaments which act selectively on the contractile mechanisms of the bladder without seriously affecting other organs such as e.g. peripheral blood vessels.

Another objective is to develop a medicament for treating urinary incontinence, in particular stress urinary incontinence, which has a relatively long-lasting effect.

Another objective is to develop a method of treating urinary incontinence, in particular stress urinary incontinence.

Preferably, a drug which can be administered orally should be developed.

A further aim is to develop a non-toxic drug with few side-effects.

The overall aim of the present invention is therefore to find an active substance having the profiles described above and to develop a suitable medicament therefrom. Detailed description of the invention

The racemate of the compound according to the invention has been known since the 1960s.

It is described, for example, in US Patent 3,341 ,584 or GB 993,584. These publications mention that the racemate has a stimulant effect on alpha- and/or beta-receptors. The Journal of Medicinal Chemistry 10 (1967) page 467 describes an alpha-adrenergic effect.

The enantiomerically pure forms of the compound, i.e. the R- or S- form are not known as pharmaceutical substances. Also not known is the use of the compound, as a racemate or in enantiomerically pure form, i.e. in the R- or S- form, in a pharmaceutical composition for treating urinary incontinence, in particular stress urinary incontinence.

The compound is used in a pharmaceutical composition in the form of the racemate or one of the pure enantiomers.

The substance may be used both as a free base and as an acid addition salt. Examples of such salts are salts of inorganic acids such as hydrochloric acid, hydrobromic acid, sulphuric acid, phosphoric acid or organic acids such as acetic acid, citric acid, tartaric acid, malic acid, succinic acid, fumaric acid, p- toluenesulphonic acid, benzenesulphonic acid, methanesulphonic acid, lactic acid, ascorbic acid et cetera. The hydrochloride is preferably used.

The compound according to the invention may be administered as a medicament by oral route, by inhalation, intranasally, intravenously, by subcutaneous, intramuscularily, transdermally, vaginalily or as a suppository. Oral administration is preferred.

The compound may be administered on its own or in conjunction with other appropriate active substances. To determine the optimum dose of the active substance for urinary incontinence, various parameters have to be taken into consideration, such as the age and body weight of the patient, and the nature and stage of the complaint.

The preferred dose for humans is between 0.001 mg and 1 g per day, preferably between 0.001 mg and 500 mg and most preferably between 0.01 mg and 100 mg and most preferably between 0.01 mg and 10 mg.

In some cases a smaller amount may be sufficient, whereas in other cases a larger total amount may be needed.

The total daily dose may be taken in one go or in several portions depending on the treatment regimen. The treatment regimen may also prescribe intervals of more than one day between doses of the drug.

The active substance according to the invention may be administered orally in various formulations, e.g. as a solid, in liquid form, as a powder, in the form of tablets, as a coated tablet, sugar-coated tablets, as an oral disintegrating tablet, as a sublingual tablet, in a capsule, in granulated form, as a suspension, solution, emulsion, elixir or syrup, in the form of drops or in other forms.

Capsules may be produced, starting from a powder of the kind mentioned above or other powders, which are packed into a capsule, preferably a gelatine capsule. It is also possible to introduce lubricants known from the prior art into the capsule or to use them to seal the two halves of the capsule. The dissolution rate of a capsule can be increased by the addition of disintegrant or solubilising substances, such as, for example, carboxymethylcellulose, carboxymethylcellulose calcium, lowly-substituted hydroxypropylcellulose, calcium carbonate, sodium carbonate, sodium carboxymethyl starch, crospovidone, croscarmellose sodium and other substances. The active substance may be contained in the capsule not only as a solid but also in solution or in suspension, e.g. in vegetable oil, polyethyleneglycol or glycerol, using surfactants, etc.

Tablets (including vaginal tablets) may be prepared in which the powdered mixture is processed to form granules, mixed with other substances if necessary and then further compressed, for example. The tablets may contain various excipients, e.g. starches, lactose, sucrose, glucose, sodium chloride, urea for soluble or injectable tablets, amylose, various types of cellulose as described above, etc. Glycerol or starch may be added, for example, as moisture retaining agents.

Starch, alginic acid, calcium alginate, pectic acid, powdered agar-agar, formaldehyde gelatine, calcium carbonate, sodium bicarbonate, magnesium peroxide and amylose, for example, may be used as disintegrants.

Sucrose, stearin, solid paraffin (preferably with a melting point in the range from ■ 50-52X), cocoa butter and hydrogenated fats may be used as anti-disintegrants or solution retardants.

Suitable resorption accelerators include, inter alia, quaternary ammonium compounds, sodium lauryl sulphate, saponines.

Ether may be used as a binder distributor, for example, and cetylalcohol, glycerol monostearate, starch, lactose, wetting agents (e.g. Aerosol OT, Pluronics, Tweens) etc. may be used as hydrophilisers. or breakdown accelerators

Moreover, the following may be considered as tablet-making excipients in general: Aerosil, Aerosol OT ethylcellulose, Amberlite resin, XE-88, Amijel, Amisterol, amylose, Avicel microcrystalline-cellulose, bentonite, calcium sulphate, Carbowax 4000 and 6000, carrageenin, castor wax, cellulose, microcrystalline cellulose, dextrane, dextrin, base for pharmaceutical tablets, kaolin, spray dried lactose (USP), lactosil, magnesium stearate, mannitol, mannitol granular N. F. methylcellulose, Miglyol 812 neutral oil, powdered milk, lactose, nal-tab, Nepol- amylose, Pofizer crystalline sorbitol, plasdone, polyethyleneglycols, polyvinylpyrrolidone, Precirol, calves' foot oil (hydrogenated), base for melting tablets, silicones, stabiline, Sta-rx 1500, Syloid, Waldhof tablet base, Tablettol, talcum cetylatum and stearatum, Tego metal soaps, dextrose and tylose. The tabletting adjuvant K (M25) is particularly preferred and also meets the requirements of the following pharmacopoeias: DAB, Ph, Eur, BP and NF.

Other excipients from the prior art may also be used.

The tablets may be produced by direct compression.

Other formulations suitable for oral administration may also be prepared, such as suspensions, solutions, emulsions, syrups, elixirs, etc. If desired, the compound may be microencapsulated.

A powder may be prepared, for example, by reducing the particles of active substance to a suitable size by grinding. v

Diluted powders may be prepared by finely grinding the powdered substance with a non-toxic carrier such as lactose and producing it as a powder. Other carrier materials which are suitable for this purpose are other carbohydrates such as starch or mannitol. If desired, these powders may contain flavourings, preservatives, dispersants, colourings and other pharmaceutically excipients.

The compound may be administered parenterally by dissolving, emulsifying or suspending it in a liquid and injecting it by subcutaneous, intramuscular or intravenous route. Suitable solvents include, for example, water or oily media.

To prepare suppositories the compound may be formulated with low-melting and water-soluble or water-insoluble materials such polyethyleneglycol, cocoa butter, higher esters (e.g. myristyl palmitate) or mixtures thereof. Examples

1. Metabolism

To determine the metabolism the enzyme CYP2D6 was allowed to act on the hydrochloride of the compound according to the invention. After 30 minutes a check was made to determine how much of the substance had been broken down by the enzyme. (-)-R-2-Amino-1-(2-fluoro-5-methanesulphonamido-phenyl)ethanol 2 was used as a comparison.

2. Efficacy and selectivity The efficacy and selectivity of the compound according to the invention is determined as follows, using the same findings as described in 1 :

Maximum contraction in the dog and activity on human urethra are percentages of contraction compared with noradrenaline.

Selectivity in the dog is the difference obtained from the percentage contraction of the dog's femoral artery at 10^"5 M and percentage contraction of the carotid artery in the dog at 10^"5 M. 3. Pharmaceutical Composition Example A: Tablets

2-amino-1-(4-hydroxy-2-methanesulphonamidophenyl)ethanol 1 mg Lactose 105 mg

Microcrystaline cellulose 30 mg

Corn starch 30 mg

Povidon 5 mg

Sodium carboxymethyl starch 5 mg Colloidal silica 3 mg

Magnesium stearate 1 mg

Total 180 mg

Preparation: The active substance is mixed with some of the excipients and granulated in the usual way. The granules are sieved, combined with the remaining excipients and compressed into tablets weighing 180 mg.

Example B: Ampoules

2-amino-1-(4-hydroxy-2-methanesulphonamidophenyl)ethanol 1.0 mg Sodium chloride 18.0 mg

Sufficient water for injection to make up to 2.0 ml

Preparation: The active substance and sodium chloride are dissolved in water for injection and transferred into glass ampoules in an aseptic condition.

Example C: Capsules

2-amino-1-(4-hydroxy-2-methanesulphonamidophenyl)ethanol 1 mg

Lactose 178 mg

Magnesium stearate 1 mg Total 180 mg Preparation: The active substance is mixed with the excipients and filled into capsules as known in the state of the art.

Preparation of the racemic compound: 5 The racemic compound can be prepared according to the procedures disclosed in GB 993,584 or US 3,341 ,584.

Preparation of the enantiomeric pure forms

The pure enantiomers of the compound of the present invention can be obtained 10 f.e. by transforming them into an diasteriomeric salt, f.e. with tartaric acid or others as mentioned above, followed by separating the two diastereomeric salts from each other via crystallisation and then liberating the pure enantiomer as the free base by adding a strong amino-base or an alkali-hydroxide.

15 Another way to obtain the pure enantiomers is purifying the racemate via HPLC by using a chiral column.

Still another way is to transform the racemic mixture into diastereomers, f.e. the diastereomeric salts as described above, to separate the two different -v diastereomers, diastereomeric salts respectively and then to liberate the pure

20. enantiomer again.

All separation procedures as such are well known in the art.

Claims (15)

Patent Claims

1. R-2-Amino-1-(4-hydroxy-2-methanesulphonamidophenyl)ethanol or a pharmacologically acceptable salt thereof for preparing a medicament.

2. S-2-Amino-1-(4-hydroxy-2-methanesulphonamidophenyl)ethanol or a pharmacologically acceptable salt thereof for preparing a medicament.

3. Compound according to one of claims 1 or 2, characterised in that the pharmacologically acceptable salt is the hydrochloride.

4. Pharmaceutical composition containing a compound according to one of claims 1 to 3.

5. Pharmaceutical composition containing a compound according to one of <, claims 1 to 3 in an amount of between 0.001 mg and 1 g per day, preferably between 0.001 mg and 500 mg and most preferably between 0.01 mg and 100 mg and most preferably between 0.01 mg and 10 mg.

6. Pharmaceutical composition according to claim 4 or 5 in the form of a tablet, or a capsule.

7. Use of a compound selected from R-2-Amino-1-(4-hydroxy-2- methanesulphonamidophenyl)ethanol, S-2-Amino-1-(4-hydroxy-2- methanesulphonamidophenyl)ethanol and/or the racemate thereof or a pharmaceutically acceptable salt thereof, preferably the hydrochloride or a pharmaceutical preparation comprising such a compound in an amount according to claim 5 or in an application form according to claim 6 for preparing a medicament for treating urinary incontinence, in particular stress urinary incontinence.

8. Use according to claim 7, characterised in that the compound contains only R-2-Amino-1-(4-hydroxy-2-methanesulphonamidophenyl)ethanol or a pharmaceutically acceptable salt thereof but not the S-form thereof.

9. Use according to claim 7, characterised in that the compound contains only S- 2-Amino-1-(4-hydroxy-2-methanesulphonamidophenyl)ethanol or a pharmaceutically acceptable salt thereof but not the R-form thereof.

10. Use according to claim 7, characterised in that the compound contains the racemate or a pharmaceutically acceptable salt thereof.

11. Use of a compound according to any of claims 7 to 10 for oral administration.

12. Use of a compound according to any of claims 7 to 10 for transdermal, parenteral, rectal or vaginal administration.

13. Method of treating urinary incontinence, in particular stress urinary incontinence, by applying a compound selected from R-2-Amino-1-(4-hydrαxy- 2-methanesulphonamidophenyl)ethanol, S-2-Amino-1-(4-hydroxy-2- methanesulphonamidophenyl)ethanol and/or the racemate thereof or a pharmaceutically acceptable salt thereof, preferably the hydrochloride or a pharmaceutical preparation comprising such a compound in an amount according to claim 5 or in an application form according to claim 6.

14. Method according to claim 13, whereby the administration route of the compound or pharmaceutical preparation is orally.

15. Method according to claim 13, whereby the administration route of the compound or pharmaceutical preparation is a transdermal, parenteral, rectal or vaginal administration.