Pharmacology Wof is true regarding tolerance occurring in regular opium abusers A Tolerance develops to all actions of morphine B No tolerance occurs to euphoric and sedative actions of morphine C No tolerance occurs to constipating and miotic actions of morphine D Lethal dose of morphine is not significantly increased 💡 Explanation Wof is true regarding tolerance occurring in regular opium abusers ✓ Correct Answer: C. No tolerance occurs to constipating and miotic actions of morphine