The present invention provides a method for treatment or prophylaxis of certain inflammatory diseases of the mammalian large intestine which comprises administrating a cytoprotective prostaglandin to a mammal who suffers from or is particularly susceptible to said inflammatory diseases of the large intestine. Cytoprotective prostaglandins refer to those prostaglandin-type compounds which are useful in reducing the incidence of NOSAC-induced lesions in the intestinal wall of the rat. "NOSAC" is an abbreviation for "nonsteroidal antiinflammatory compound.
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