The mechanism of action of the antidiarrheal atropine (Lomotil) is to
1. promote stool passage.
2. block dopamine receptors in the brain.
3. increase stool formation.
4. slow peristalsis.
Correct Answer: 4
Rationale 1: Laxatives promote stool passage and increase size of stool.
Rationale 2: Antiemetics block dopamine and inhibit vomiting centers.
Rationale 3: Laxatives increase stool.
Rationale 4: Antidiarrheals such as atropine slow peristalsis and allow water reabsorption.
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