patients whose duodenal ulcers had been healed by treatment with an h2-receptor antagonist were randomized to receive single-blind treatment with either 35 micrograms enprostil ( n = 64 ) or 150 mg ranitidine ( n = 64 ) at bedtime for periods of up to 1 year .
C0013295
duodenal ulcers
C0034665
ranitidine