Tolerance occurs to all side effects of Morphine, EXCEPT: (A) Sedation, (B) Constipation, (C) Pain relieving, (D) Euphoric effect
Answer is B. Ans. is 'b' i.e., Constipation High degree of tolerance develops to morphine and related opioids if the drug is used repeatedly.Tolerance develops to all the actions except constipating and miotic action.