Methacolamine has maximum agonists action at which of the following cholinergic receptors: (A) M1, (B) M2, (C) M3, (D) M4
Answer is B. Katzung 12e p100 KDT 7/e p101 Methacolamine is a non selective muscarine agonists. It has maximum agonist action on M2 receptors. relative selective agonist of cholinergic receptors are: M1 selective -Oxatremorine M2 selective -Methacolamine M3 selective- bethanocol