IE74137B1 - Pharmaceutical preparation for topical application - Google Patents

Description

The pharmaceutical preparations are useful as topical analgesics and anti-inflammatory agents.

Drugs for oral and rectal administration and injectable solutions containing lysine clonixinate as active substance are known from the literature, for example from DE-PS 2,253,134 and US-PS 3,973,027 and/or are available on the market. These drugs develop a good analgesic and antiinflammatory activity. However, there are cases in which they are not suitable or applicable. Thus, when a person A 741 37 suffers from pain in a limited area of the body, for example after a blow or knock or due to a minor accident, in the case of contusions, distortions, luxations or arthritis, arthrosis, tenalgia, bursitis, myalgia and sport injuries, a localized topical application of a substance is generally regarded as the most suitable way or the most suitable method for healing. It is also important not to apply an active substance more strongly or more weakly than is necessary to relieve or eliminate the pain or inflammation, and thus to avoid unnecessary secondary reactions or habituation to the active substances, or dependence thereon, or obtaining only slight relief.

Finally, topical formulations such as creams or gels are less dangerous than tablets, in particular for selfmedication, as is made possible by freely purchasable remedies. Thus, the making available of remedies for topical application which develop a mean analgesic and anti-inflammatory activity is an important problem in therapeutics.

Topical formulations containing the analgesic/antiinflammatory agent as active substances are generally known from the literature. For example, NL-OS 8,100,917 (1982), CH-PS 651,474 (1985) and US-PS 4,407,824 (1983) relate to the amine salts of diclofenac. In DE-OS 2,935,776 (1981) as well various organic salts of anti-inflammatory medicaments are named which are suitable for topical application.

It has now been found that the L-lysine salt of 2-((3chloro-2-methylphenyl)amino]-3-pyridine carboxylic acid is very well suited to the preparation of pharmaceutical compositions for topical application and develops a very good effect on such an application.

The subject of the invention is therefore pharmaceutical preparations for topical application, preferably in the form of creams or gels, which with respect to the weight contain as active substance 1 to 10 % by weight L-lysine salt of the 2-((3-chloro-2-methylphenyl)amino]-3-pyridine carboxylic acid and 2 to 15 % by weight pharmaceutically acceptable emulsifiers, 2 to 20 % by weight pharmaceutically acceptable emollients or softening agents, 0.01 to 0.2 % by weight pharmaceutically acceptable preservation substances and water to make up 100 % by weight. Possibly, these agents may also contain 0.2 to 5 % by weight rubefacients and in the case of creams 3 to 18 % by weight pharmaceutically acceptable lubricants or in the case of gele 0.5 to 5 % by weight pH-value modifiers, the accompanying water always being adjusted to make up 100 % by weight.

The pharmaceutical preparations according to the invention are distinguished by the following advantages: local action, rapid response/reaction due to rapid absorption, low toxicity in uninjured or undamaged tissues or organe.

According to an preferred embodiment the pharmaceutical preparations according to the invention for topical application contain 3 to 7 % by weight L-lysine salt of the 2-1 (3-chloro-2-methylphenyl) amino)-3-pyridine carboxylic acid as active substance, 3 to 13 % by weight pharmaceutically acceptable emulsifiers, 3 to 10 % by weight pharmaceutically acceptable emollients, 0.02 to 0.1 % by weight pharmaceutically acceptable preservation substances and water as remainder up to 100 %. Possibly, 0.5 to 2 % by weight rubefacients may also be contained therein and in the case of creams 8 to 12 % by weight pharmaceutically acceptable lubricants and in the case of gels 1 to 3 % by weight modifiers of the pH-value, the accompanying water always being made up to a total of 100 %.

Advantageously, the emulsifiers are selected from the group 5 of the following substances: Glyceryl monostearate, glyceryl monostearate/polyoxyethylene stearate, ketostearyl alcohol/potassium lauryl sulfate (emulsifier wax) and carbomer.

The softening agent or emollient is preferably selected 10 from propylene glycol, glycerol, sorbite and isopropyl myristate.

As preservative agents or substance, methyl parabene, ethyl parabene and propyl parabene have proved expedient.

Menthol is advantageously used as rubefacient.

As already mentioned, the pharmaceutical preparations according to the invention are preferably brought into the galenic form of a cream or a gel.

If the pharmaceutical preparation according to the invention is to be formulated as cream, as emulsifier -° advantageously ketostearyl alcohol/lauryl sulfate (emulsifier wax) is used and the lubricants are selected from the group consisting of mineral oil, vaseline and fatty acids.

If the pharmaceutical preparations according to the 5 invention are formulated as gel, advantageously carbomer is used as emulsifier and propylene glycol as softening agent, and the modifiers for the pH-value or buffer are selected from the group consisting of sodium hydroxide, triethanol amine, trimethamine, (tris(hydroxymethyl)amino methane) and lysine.

For both creams and gels, isopropyl myrietate is very well suited as softening agent or emollient.

Of the preservation agents, methyl parabene and propyl parabene are preferred.

According to the invention, the L-lysine salt of the 2-((3chloro-2-methylphenyl) amino]-3-pyridine carboxylic acid can be used for the preparation of a pharmaceutical composition for topical application in order to relieve or at least alleviate pain and/or inflammations in humans and animals.

The following examples serve for more detailed explanation of the invention.

Example 1: Topical pharmaceutical preparation in the form of a cream without rubefacient.

A cream was made having the following composition: lysine clonixinate isopropyl myristate methyl parabene emulsifier wax mineral oil water up to .0 % by weight 9.0 % by weight 0.1 % by weight 13.0 % by weight 10.0 % by weight 100.0 % by weight The lubricant, emulsifier and the emollient are melted together at 65 to 70°C. The active substance and the preservation agent are dissolved in water. The oily phase is added under constant stirring to the aqueous solution and after cooling to room temperature the desired cream is obtained.

Example 2: Topical pharmaceutical preparation in the form of a cream with a rubefacient.

A cream of the following composition was prepared: lysine clonixinate isopropyl myristate methyl parabene propyl parabene emulsifier wax vaseline menthol water up to .0 % by weight 10.0 % by weight 0.1 % by weight 0.02 % by weight .0 % by weight 10.0 % by weight 1.0 % by weight 100.0 % by weight The lubricant and the emulsifier were melted together at 65-70°C. The active substance and the preservation agent were dissolved in water. The oil phase is added under constant stirring to the aqueous solution.

Menthol was dissolved up to complete solution in the emollient. d After cooling to 40°C the menthol solution in the emollient was added to the emulsion with constant stirring. After cooling to room temperature the desired cream was obtained.

Example 3: Topical pharmaceutical preparation in the form of a gel without rubefacient.

A gel of the following composition was prepared: - lysine clonixinate 5.0 % by weight - carbomer 3.0 % by weight - propylene glycol 5.0 % by weight - isopropyl myristate 3.0 % by weight - glycerol - methyl parabene - propyl parabene - sodium hydroxide - water up to 3.0 % by weight 0.1 % by weight 0.02 % by weight 1.5 % by weight 100.0 % by weight The active substance was dissolved in the mixture of propylene glycol and glycerol (solution A) . The preservation substances were dissolved in water, the emulsifier was dispersed in the aqueous solution and the buffer (pH-modifier) was added (dispersion B). The solution A was poured over the dispersion B and finally isopropyl myristate was added.

Example 4: Topical pharmaceutical preparation in the form of a gel with rubefacient.

A gel of the following composition was prepared: lysine clonixinate carbomer propylene glycol isopropyl myristate methyl parabene sodium hydroxide menthol water up to .0 % by weight 3.0 % by weight 6.0 % by weight 3.5 % by weight 0.1 % by weight 2.0 % by weight 1.0 % by weight 100.0 % by weight The active substance was dissolved in the propylene glycol 25 and a third of the total amount of water (solution A). The preservation substance was dissolved in the remaining water and the emulsifier dispersed in said aqueous solution; thereupon, the buffer (pH-modifier) was added (dispersion B). The solution A was then poured into the dispersion B 30 whilst stirring and finally the menthol dissolved in isopropyl myristate added. The pH-value was checked and adjusted to 8.2-8.9.

The following examples 5 and 6 will explain the advantageous use of the topical agent according to the invention compared with a conventional analgesic/antiinflammatorv agent (diclofenac) both as regards the alleviation of inflammations and the absorption or takeup (through the skin).

Example 5 Anti-inflammatory effect. Paw edema induced by carragheenin Carragheenin in 1 % dosage was administered to Wistar rats of both sexes, body weight 175-200 g, that is 0.1 ml into the paw, corresponding to the procedure adopted by Winter et al. (J. Pharmacol, and Exp. Therap. 1949, 96; 99). 30 minutes previously, in each case one of the three groups of six test animals had been treated with the following compositions: lysine clonixinate cream corresponding to example 1, 5 %; 20 mg/kg; sodium diclofenac 5 %, 20 mg/kg; excipient; in each case on an area of 20 cnP on the back of the previously shaved animals. The inflammatory edema of the paw was measured with a Ugo Basile plethysmometer 3 and 5 h after the carragheenin administration. The percentage alleviation or reduction of the inflammation was determined with respect to the control group. The results are summarized in the following Table 1.

Table 1 Percentage alleviation of the inf lamination by the various compounds tested Pharmaceutical preparation % alleviation h 5 h lysine clonixinate 50 48 sodium diclofenac 35 30 Example 6 Transdermal absorption. Comparative tests between a cream and a gel each containing lysine clonixinate, with corresponding commercially available products As test animals, Flemish giant rabbits having a body weight of about 3.5 kg were used which had been shaved on their )5 backs over an area of 10 cm\ Each group contained three animals which had been treated with the following formulations and the following doses: a) Lysine clonixinate, 5 % cream, 20 mg/kg, prepared according to example 1. b) Lysine clonixinate, 5 % gel, 20 mg/kg, prepared according to example 3. c) Sodium diclofenac, 5 % cream, 20 mg/kg. d) Diclofenac diethyl ammonium salt, 5 % gel, 20 mg/kg.

Blood samples were taken from the central artery of the ear and the concentrations of the various active substances determined.

The results are shown in the following Table 2 and in the diagram attached as Fig. 1.

Table 2 Concentration of lysine clonixinate and diclofenac in mg/ml in the various formulations and at various times Pharmaceutical preparation — time h 1 2 3 4 6 20 24 Lysine cloni- xinate cream 0,56 ♦ 0,11 0.58 +0,12 0,61 £ 0,13 0,66 + 0.13 0,62 + 0,14 0,19 + 0,04 0,07 + 0,02 Cel 0,54 £ 0.10 0,60 +0,11 0,62 £ 0,12 0,68 + 0,14 .0,60 + Ο.» 0,17 + 0,03 0,08 +‘ 0,02 Diclo- fenac cream 0,30 £ 0.07 0,35 +0.08 0,42 £ 0,08 0,50 + 0,10 0,30 + 0,07 0,18 + 0,04 0,10 + 0,02 Cel 0,36 * 0,06 0,40 +0,08 0,45 £ 0,08 0,48 + 0,09 0,37 + 0,07 0,16 + 0,03 0,09 + 0,02

Claims (15)

1. Pharmaceutical preparations for topical application containing 1 to 10 % by weight L-lysine salt of the 2-((3chloro-2-methylphenyl) amino]-3-pyridine carboxylic acid as active substance. 2 to 15 % by weight pharmaceutically acceptable emulsifiers, 2 to 20 % by weight pharmaceutically acceptable emollients, 0.01 to 0.2 % by weight pharmaceutically acceptable preservation substances and the remainder water made up to 100 % by weight, and possibly 0.2 to 5 % by weight rubefacients, the water being correspondingly adjusted to a total of 100 % by weight.

2. Pharmaceutical preparations according to claim 1, characterized in that they are present in the form of a cream or gel and in the case of a cream additionally contain 3 to 18 % by weight pharmaceutically acceptable lubricants and in the case of a gel 0.5 to 5 % by weight pH-value modifiers (buffers), the water content being correspondingly adjusted to 100 % by weight.

3. Pharmaceutical preparations according to claim 1 or 2, characterized in that they contain 3 to 7 % by weight of the L-lysine salt of the 2-[(3-chloro-2methylphenyl) amino]-3-pyridine carboxylic acid as active substance, 3 to 13 % by weight pharmaceutically acceptable emulsifiers, 3 to 10 % by weight pharmaceutically acceptable emollients, 0.02 to 0.1 % by weight pharmaceutical preservation substances, and the remainder water corresponding to 100 % by weight, possibly additionally 0.5 to 2 % by weight rubefacients, and in the case of creams 8 to 12 % by weight pharmaceutically acceptable lubricants and in the case of gels 1 to 3 % by weight pH-value modifiers, the proportion of accompanying water having been correspondingly adjusted to 100 %.

4. Pharmaceutical preparations according to any one of claims 1 to 3, characterized in that the emulsifier is selected from the group consisting of glyceryl monostearate, glyceryl monostearate/polyoxyethylene stearate, ketostearyl alcohol/ sodium lauryl sulfate (emulsifier wax) and carbomer.

5. Pharmaceutical preparations according to any one of claims 1 to 4, characterized in that the emollient is selected from the group consisting of propylene glycol, glycerol, sorbite and isopropyl myristate.

6. Pharmaceutical preparations according to any one of claims 1 to 5, characterized in that the preservation agent is selected from the group consisting of methyl parabene, ethyl parabene and propyl parabene.

7. Pharmaceutical preparations according to any one of claims 1 to 6, characterized in that the rubefacient is menthol.

8. Pharmaceutical preparations according to any one of claims 2 to 7, characterized in that in the case of a cream they contain as emulsifier ketostearyl alcohol/sodium lauryl sulfate (emulsifier wax).

9. Pharmaceutical preparations according to any one of claims 2 to 7, characterized in that in the case of a gel they contain carbomer as emulsifier.

10. Pharmaceutical preparations according to any one of claims 2 to 7 and 9, characterized in that they contain propylene glycol as emollient.

11. Pharmaceutical preparations according to any one of claims 2 to 10, characterized in that they contain isopropyl myristate as emollient.

12. Pharmaceutical preparations according to any one of claims 2 to 11, characterized in that they contain as preservation agent methyl parabene or propyl parabene.

13. Use of the L-lysine salt of the 2-((3-chloro-2methylphenyl) amino]-3-pyridine carboxylic acid for producing a pharmaceutical preparation for topical application which relieves/alleviates pain and/or inflammation in humans and animals.

14. A pharmaceutical preparation according to claim 1, substantially as hereinbefore described and exemplified.

15. Use according to claim 13, substantially as hereinbefore described.