PMID: 2507215Sep 1, 1989Paper

Misoprostol: a prostaglandin E1 analogue

Clinical Pharmacy
R E Garris, C F Kirkwood

Abstract

The pharmacology, pharmacokinetics, clinical efficacy, contraindications and precautions, adverse effects, dosage, and cost of misoprostol are reviewed. Misoprostol is a synthetic analogue of natural prostaglandin E1. It produces a dose-related inhibition of gastric acid and pepsin secretion and enhances mucosal resistance to injury. Misoprostol is extensively absorbed from the stomach and undergoes rapid de-esterification to its biologically active metabolite, misoprostol acid. The average absorption after an oral dose is 88%; peak plasma concentrations of misoprostol acid are achieved in less than 30 minutes. Clinical trials have demonstrated ulcer healing rates of approximately 60-80% in patients with duodenal ulcers who received misoprostol 800 micrograms daily for four weeks. Misoprostol was generally no more efficacious than conventional therapy with the H2-receptor antagonists cimetidine and ranitidine. The healing rate observed for gastric ulcers was less than that observed for duodenal ulcers. In trials involving healthy volunteers and patients with arthritis receiving aspirin, naproxen, tolmetin, ibuprofen, or piroxicam, misoprostol was consistently superior to placebo, cimetidine, and sucralfate in the prevention of ...Continue Reading

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