Abstract
The effect of atropine sulfate, trihexyphenidyl HCl, benztropine mesylate, diphenhydramine HCl and ethopropazine HCl on gastric emptying and intestinal transit of a phenol red solution in the rat was examined. Intraperitoneal administration of 0.3 mg/kg atropine, 1.2 mg/kg benztropine and trihexyphenidyl results in a marked decrease in gastric emptying and intestinal transit rate when compared to controls. Oral administration of these agents produced variable and unpredictable results. Single and multiple oral dose (0.6--3 mg/kg) studies with trihexyphenidyl failed to produce any significant decreases in gastric emptying rates. A single oral dose of benztropine (0.6--3 mg/kg) failed to reduce the gastric emptying rate, but multiple dose studies produced a significant decrease in the gastric emptying rate. Effects on gastric emptying and intestinal transit were seen after single and multiple oral doses of diphenhydramine and ethopropazine.
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