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PubMed2003

Composite film-coated tablets intended for colon-specific delivery of 5-aminosalicylic acid: using deesterified pectin.

Combinations of Eudragit RS and deesterified pectin, polygalacturonic acid (PGA), or its potassium and sodium salts, when applied as a film coat, has a potential value as a colon-specific delivery system. Dispersions of PGA in Eudragit RS were used as the film former for coating of 5-aminosalicylic acid (5-ASA) tablet cores. Drug release behavior was assessed, in vitro, under simulating conditions in term of pH and time to in vivo during their transit to the colon. Negligible drug release occurred during first 5 hr where the coated tablets were in the stomach and small intestine. After that, the pectinolytic enzymes were added into the pH 6.8 medium to simulate the in vivo condition where there is the digestion of bacteria in the colon. The release of 5-ASA from the coated tablets occurred linearly as a function of time. Drug release depended on the composition of the mixed film, as well as the ratio of Eudragit RS to PGA or its salts. The highest drug release from the coated tablets of about 40% was obtained when the ratio of Eudragit RS to potassium salt of PGA was 2.5 to 1. Drug release profiles seemed to conform to the mechanism involving the osmotically driven release and formation of channels in the film caused by dissolution of PGA salts. Channel formation was, in most cases, activated by the presence of pectinolytic enzymes, showing that the PGA in the mixed film was subjected to enzymic breakdown. In conclusion, PGA could be used as an additive in Eudragit RS films to control the release of colonic delivery system.

Acrylic Resins↗
PubMed1997

Acute pancreatitis after long-term 5-aminosalicylic acid therapy.

Acute pancreatitis is a known, although rare, complication of mesalamine treatment. This complication typically appears within the first days or weeks after initiation of therapy. We describe two cases of acute pancreatitis that occurred after long term mesalamine therapy for ulcerative colitis. A rechallenge, performed in both patients, confirmed the diagnosis of mesalamine-induced pancreatitis. These case reports provide evidence that 5-aminosalicylic acid may induce acute pancreatitis after long term treatment.

Acute Disease↗