Formulation comprising antibacterial substance and antiulcer substance

Abstract

The present invention includes a formulation which comprises an antibacterial substance and an antiulcer substance, wherein at least either of them is formulated into a gastrointestinal mucosa-adherent solid preparation. The formulation of the present invention shows long retention time in the gastrointestinal tract because of adhesion to the gastrointestinal tract mucosa, synergetically enhances the pharmaceutical effects of an antibacterial substance, specially antibiotic against Helicobacter pylori (HP) and an antiulcer substance, with very low doses of active ingredients, particularly the anti-HP antibiotic with low prevalence of side effects. The present agent is useful as an antiulcer agent, showing potent anti-HP activity.

Description

[0001] The present invention relates to a formulation which comprises an antibacterial substance and an antiulcer substance, wherein at least either of them is formulated into a gastrointestinal mucosa-adherent solid preparation. The formulation of the present invention is used as an antiulcer agent and for other purposes.[0002] Since the isolation of Helicobacter pylori (hereinafter also referred to as HP) in 1983 [Lancet, 1, 1273 (1983)], its association with gastritis and digestive ulcer has drawn attention. This is because HP is found at high positivity rates in chronic gastritis or gastric ulcer [American Journal of Gastroenterology, 82, 2283 (1987)], despite the fact that it is normally not found in the mucosa of healthy humans [APMIS, 96, 84 (1988)].[0003] On the other hand, the development of H.sub.2 blockers and proton pump inhibitors (hereinafter also referred to as PPI) has resulted in markedly improved healing rates for gastric / duodenal ulcer. However, there are some con...

AI Technical Summary

Benefits of technology

[0009] The present inventors investigated to obtain a safer therapeutic formulation for gastric / duodenal ulcer that exhibits antiulcer effect with more potent anti-HP activity. As a result, the present inventors found that a formulation comprising an anti-HP antibiotic and an antiulcer substance, wherein at least one is formulated into a gastrointestinal mucosa-adherent solid preparation, synergistically enhances the antibiotic's anti-HP activity, as well as the antiulcer the action of antiulcer substance due to the combined effect of both agents, thus providing a formulation of lower prevalence of side effects. The inventors made further investigations based on these findings, and developed the present invention.

[0138] The formulation of the present invention shows long retention time in the gastrointestinal tract because of its adhesion to the gastrointestinal tract mucosa, synergetically enhances the pharmaceutical effects of an antibacterial substance and an antiulcer substance, with very low, doses of active ingredients, particularly the anti-HP antibiotic, e.g. about one-half to about one-tenth of the usual clinical dose, with low prevalence of side effects. The present agent is useful as an antiulcer agent, showing potent anti-HP activity.

Problems solved by technology

However, there are some contractile cases in which no improvement occurs despite the appropriate treatment using these drugs, posing major problems.

Although some PPIs possessing anti-HP activity have been developed, they remain unsatisfactory as to healing effect when used alone because their antibacterial action against HP is not always sufficient.

Antibacterial substances such as amoxicillin (hereinafter also referred to as AMOX), metronidazole (hereinafter also referred to as MZ), bismuth subacetate and tetracycline, have been used against HP singly or in combination; however, their administration often causes side effects such as diarrhea, nausea and retching because of the considerable doses (e.g., 750 mg of AMOX or 500 mg of MZ administered three times a day).

Also, a pharmaceutical composition containing an anti-HP antibiotic (e.g., AMOX) and pantoprazol (WO 92 / 03135), and an administration comprising AMOX and omeprazole in combination (Scandinavian Journal of Gastroetherology, 24, 49 (1989) are reported, but their antiulcer action is unsatisfactory and their administration causes side effects as mentioned above.

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