Abstract
1. The selective 5-HT3 receptor antagonist, ICS 205-930 (Sandoz), has been reported to have potent effects on gastric smooth muscle in vivo and to enhance gastric emptying in animals and in man. 2. This study investigated the effects of ICS 205-930 on fat-delayed gastric emptying of a semisolid meal and antral motor activity in humans. 3. Twelve healthy men participated in each of three studies in which 10 or 20 mg of ICS 205-930 or placebo were infused i.v. in a random double-blind fashion. Gastric emptying and antral motor activity were studied scintigraphically. 4. Gastric emptying was not altered after 10 mg but slower after 20 mg of ICS 205-930 than after placebo. Emptying after 20 mg of ICS 205-930 was significantly slower than after 10 mg of ICS 205-930. 5. Antral contraction amplitude was slightly lower after 20 mg of ICS 205-930 than after placebo, whereas the effects of 10 mg ICS 205-930 did not differ from those of placebo. 6. The results suggest that the investigated doses of ICS 205-930 have only slight effects on gastric motor activity of healthy young men, with 20 mg reducing the rate of emptying.
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