Pharmacology An anti-emetic drug that also decreases acid secretion due to its action on H1 receptors is: A Promethazine B Domperidone C Metoclopramide D Ondansetron 💡 Explanation An anti-emetic drug that also decreases acid secretion due to its action on H1 receptors is: ✓ Correct Answer: A. Promethazine