The safety and various side effects of ranitidine (2 X 150 mg daily), a new selective H2-receptor antagonist, were evaluated in the long-term treatment of patients with prepyloric or duodenal ulcer. A total of 6 adverse effects was reported by 5 out of 32 patients (18.7%). Thus, the overall incidence was low and almost half of the adverse effects involved minor or functional gastrointestinal symptoms. In no case were side effects severe enough to necessitate interruption of therapy. There were no detectable changes in haematological or biochemical blood parameters attributable to ranitidine. Long-term therapy with ranitidine appears to be safe and well tolerated; however, continued surveillance must be maintained.
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