Pharmacology The H3 receptor agonist exhibits all of the following actions except: A Inhibition of H1 receptor induced wakefulness B Increase in H1 mediated gastrin secretion C Inhibition of H1 mediated bronchoconstriction D Negative chronotropic effect on atria 💡 Explanation The H3 receptor agonist exhibits all of the following actions except: ✓ Correct Answer: B. Increase in H1 mediated gastrin secretion