Which option is NOT listed as a prokinetic in the vagal indigestion treatment options?

• A. Loperamide
• B. Erythromycin
• C. Cisapride
• D. Bethanechol

Answer: (A)

Prokinetics are drugs that increase gastrointestinal motility to overcome functional stasis, which is what vagal indigestion involves in the forestomachs. Loperamide is not a prokinetic; it’s an opioid that slows intestinal transit and reduces motility, used mainly as an anti-diarrheal. The other options act to stimulate motility: erythromycin is a motilin receptor agonist that promotes rhythmic contractions of the gut, cisapride is a 5-HT4 agonist that enhances acetylcholine release and peristalsis, and bethanechol directly stimulates muscarinic receptors to increase smooth muscle contractions. So loperamide does not fit with the prokinetic agents used for vagal indigestion.