ANTIMICROBIAL PHARMACEUTICAL COMPOSITION

Abstract: The invention relates to a synergistic, anti-­ microbial pharmaceutical composition containing 0.01 to 50 % by weight of a quinolinecarboxylic acid deriva­ tive or a naphthyridinecarboxylic acid derivative of the general formula (I), wherein X is carbon or nitrogen; R¹ is hydrogen or fluorine; R² is methyl, piperazino or methylpiperazino group; or R¹ and R² together are a methylenedioxy group; and 0.01 to 95 % by weight of a tetracycline derivative of the general formula (II), wherein R³ and R⁴ are hydrogen; or R³ and R⁴ together represent an additional chemical bond, in an 1:1 to 1:20 ratio of the compound of the general formula (I) to the compound of the general formula (II), optionally in an admixture with an amount required to 100 % by weight of an inert, solid or liquid carrier such as magnesium carbonate, magnesium stearate, starch, talc, cyclodextrine or water and other additives such as filling, disintegrating, sliding and emulsifying agents.

Description: This invention relates to synergistic, anti-microbial pharmaceutical compositions containing a quinolinecarboxylic acid derivative or a naphthyridine-carboxylic acid derivative of the general formula (I) wherein X is a carbon or nitrogen atom; R¹ is a hydrogen or fluorine atom; R² is a methyl, piperazino or methylpiperazino group; or R¹ and R² together are a methylenedioxy group; and a tetracycline derivative of the general formula (II) wherein R³ and R⁴ are each 2 hydrogen atom; or R³ and R⁴ together represent an additional chemical bond, as active ingredients. In another aspect of the invention, there is provided a process for the preparation of these compositions. In the antimicrobial therapy, a continuous combat exists between the adaptation capability of microorganisms (development of resistance) and the preparation of novel drugs. In the case of novel drugs, the adaptation capability, i.e. the resistance, usually develops within a shorter or longer period. It can be expected that the development of the resistance becomes particularly rapid when the new substance is a derivative of a drug previously used for a long time, since in this case the resistance developed to the starting compound will of course more rapidly be modified for the derivatives. The development of the resistance can be delayed by the simultaneous administration of several active compounds whereby the metabolism of the microorganisms is attacked at several points at the same time. This results in the resistance of the microorganisms to the combination hardly developing or only long afterwards. Thus, the desired "microbicidal" (killing) effect is strengthened. In antimicrobial therapy, nalidixic acid has been used for a long time as active ingredient. It is known that of its derivatives, norfloxacin (Belgian patent specification. No. 863,429) and pefloxacin (Belgian patent specifications Nos. 870,576 and 870,917) show a highly favourable effect on gram-negative pathogens whereas their effect on gram-positive pathogens is more moderate. Tetracycline is also a long-known antimicrobial substance. Of its derivatives, doxicycline has a very favourable effect on gram-positive pathogens and a moderate effect on gram-negative ones. GB-A-2 035 800 generally describes combinations of antibiotics and β-ketoacids, and FR-A-2 563 433 describes combinations of oxytetracycline and oxolinic or nalidixic acid. The aim of the invention is to prepare broad-spectrum pharmaceutical compositions by combining these two types of active substances and thereby to inhibit the development of resistance. When combining tetracycline derivatives with the quinoline-carboxylic acid derivatives or naphthyridinecarboxylic acid derivatives of the general, formula (I), it was surprisingly observed that, in addition to the realization of the aim of the invention, a high-level synergistic action of these two types of active substances occurred, whereby the effective doses could be significantly decreased with the important advantages of fewer side-effects and a cheaper therapy. Thus, the present invention relates to the preparation of a synergistic, antimicrobial pharmaceutical composition containing a quinolinecarboxylic acid derivative or a naphthyridinecarboxylic acid derivative of the general formula (I) as defined above; and a tetracycline derivative of the general formula (II) as defined above as active ingredients, which comprises mixing together 0.01 to 50 % by weight of a derivative of the general formula (I) and 0.01 to 95 % by weight of a tetracycline derivative of the general formula (II), while maintaining the ratio of the compound of the general formula (I) to the compound of the general formula (II) as 1:1 to 1:20, and optionally inert, solid or liquid carriers, preferably magnesium carbonate, magnesium stearate, starch, talc, cyclodextrin or water as well as binding, disintegrating, emulsifying, sliding agents and lubricants as additives and formulating them in a known way to give a pharmaceutical composition suitable for therapeutical application. In the process of the invention, preferably a compound of the general formula (I), wherein X, R¹ and R² are as defined above, suitably norfloxacin (1,4-dihydro-1-ethyl-6-fluoro-4-oxo-7-piperazinoquinoline-3-carboxylic acid) and doxicycline (4-dimethylamino-1,11-dioxo-6-methyl-1,4,4a,5,5a,6,11,12a-octahydro-3,5,10,12,12a-pentahydroxy-2-naphthacenecarboxamid) may be used as active ingredients of the combination. Similarly, oxolinic acid (1,4-dihydro-1-ethyl-6,7-methylenedioxy-4-oxoquinoline-3-carboxylic acid) and methacycline (4-dimethylamino-1,11-dioxo-6-methylene-1,4,4a,5,5a,6,11,12a-octahydro-3,5,10,12,12a-pentahydroxy-2-naphthacenecarboxamide) may preferably be used in the combination according to the invention. According to a preferred embodiment of the invention, the active ingredients are used in an 1:1 ratio. If desired, the compositions may contain also other active ingredients, (such as antibiotics or chemotherapeutics). The pharmaceutical compositions according to the invention may be formulated in solid forms, such as granulates, tablets, capsules, dragées and suppositories, semisolid forms, such as ointments or liquid forms, such as injectable solutions, emulsions or suspensions. Preferably gels, ointments, dusting powders for wounds, injectable solutions and suspensions as well as the combinations of powder and solvent ampoules are prepared. Depending on the formulation, magnesium carbonate, magnesium stearate, starch, talc and water as commonly used carriers, cyclodextrin as a novel carrier as well as other additives such as vehicles, disintegrating, sliding and emulsifying agents may be used. The compositions according to the invention may be administered by the oral, parenteral or rectal route or may be used topically. The orally useful compositions are e.g. granulates, tablets, capsules or dragées. Parenterally useful compositions are e.g. aqueous emulsions, suspensions or solutions. Ointments, aqueous or oily emulsions and suspensions as well as sprays may be applied topically. The pharmaceutical compositions containing the synergistic active ingredient combination may also be used in veterinary medicine, e.g. in the form of a powder mixed with the fodder, or in the form of a solution added to the drinking fluid of the animals. For this purpose, compositions containing a combination of oxolinic acid and methacycline are preferably used. The in vitro biological activity of the compositions according to the invention are shown in Tables I to V. The international resistant and/or polyresistant human-pathogenic and/or veterinary-pathogenic microorganisms used in these investigations were as follows. 1.) Vibrio parahaemolyticus CCM.5938. 2.) Pseudomonas fluorescens CCM.2115. 3.) Pseudomonas pictorum CCM.284. 4.) Pseudomonas acidovorans CCM.283. 5.) Proteus vulgaris CCM.1799. 6.) Proteus mirabilis CCM.1944. 7.) Shigella sonnei CCM.1373. 8.) Salmonella typhimurium CCM.5445 9.) Salmonella cholerae suis CCM.5438. 10.) Escherichia coli DSM.30038. 11.) Escherichia coli CCM.5863. 12.) Escherichia coli CCM.5172. 13.) Klebsiella pneumoniae CCM.1848. 14.) Serratia marcescens CCM.303. 15.) Pasteurella multocida CCM.5419. 16.) Staphylococcus aureus CCM.885. 17.) Staphylococcus aureus CCM.2317. 18.) Staphylococcus aureus CCM.2326. 19.) Streptococcus agalactiae CCM.5534. 20.) Streptococcus disgalactiae CCM.5548. 21.) Bacillus subtilis ATCC.6633. 22.) Micrococcus flavus ATCC.10240. 23.) Bacillus licheniformis CCM.2182. 24.) Bacillus licheniformis CCM.2205. 25.) Pseudomonas putrefaciens Sz-III-156. 26.) Pseudomonas fluorescens putida M-III-21. 27.) Pseudomonas fluorescens putida K-I-86. Abbreviations used hereinabove and hereinafter are as follows: ATCC = The American Type Culture Collection CCM = Czechoslovak Collection of Microorganisms DSM = Deutsche Sammlung für Mikroorganismen µg/ml = microgram/millilitre The investigations were carried out on a Difco Bouillon medium (in the case of bacteria) or on a modified Difco Bouillon medium (in the case of vibrios). The inoculation was made with a germ number of 5 x 10⁵/ml. The incubation lasted 24 hours at 37 °C. It is obvious from the data of the Tables that, due to the synergistic effect, from the combination a part and in some cases even a fraction of the amounts of the active ingredients, (as calculated for their individual activity), is sufficient to achieve an identical effect.

Claims: Synergistic, antimicrobial pharmaceutical compostion which comprises 0.01 to 50 % by weight of a quinolinecarboxylic acid derivative or a naphthyridinecarboxylic acid derivative of the general formula (I) wherein X is a carbon or nitrogen atom; R¹ is a hydrogen or fluorine atom; R² is a methyl, piperazino or methylpiperazino group; or R¹ and R² together are a methylenedioxy group; and 0.01 to 95 % by weight of a tertracycline derivative of the general formula (II) wherein R³ and R⁴ are each a hydrogen atom; or R³ and R⁴ together represent an additional Chemical bond, in an 1:1 to 1:20 ratio of the compound of the general formula (I) to the compound of the general formula (II), optionally in an admixture with an inert, solid or liquid carrier. and other additives. A composition as claimed in claim 1 which comprises doxicycline (4-dimethylamino-1,11-dioxo-6-methyl-1,4,4a,5,5a,6,11,12,12a-octahydro-3,5,10,12,12a-pentahydroxy-2-naphthacenecarboxamide) as active ingredient of formula (II). A composition as claimed in claim 2, which comprises norfloxacin (1,4-dihydro-1-ethyl-6-fluoro-4-oxo-7-piperazinoquinoline-3-carboxylic acid) and doxicycline as active ingredients. A composition as claimed in claim 1, which comprises oxolinic acid (1,4-dihydro-1-ethyl-6,7-methylenedioxy-4-oxoquinoline-3-carboxylic acid) and methacycline (4-dimethylamino-1,11-dioxo-6-methylene-1,4,4a,5,5a,6,11,12,12a-octahydro-3,5,10,12,12a-pentahydroxy-2-naphthacenecarboxamide) as active ingredients. A composition as claimed in claim 1, which comprises the active ingredients in an 1:1 ratio. Process for the preparation of a composition according to claim 1, which comprises mixing together 0.01 to 50 % by weight of a derivative of the general formula (I) and 0.01 to 95 % by weight of a tetracycline derivative of the general formula (II), while maintaining the ratio of the compound of the general formula (I) to the compound of the general formula (II) as 1:1 to 1:20, and optionally inert, solid or liquid carriers and additives.

Inventors: FRANK, JUDIT, KALOY, KATALIN, KULCSAR, GABOR, SARKOZY, PETER
Applicants: CHINOIN GYOGYSZER ES VEGYESZETI TERMEKEK GYARA RT.
Application year: 1988
Main classification: A61K31
IPC codes: A61K31, A61P31