Surgery Which of the following drugs cause relaxation of LES? 1. Nitrates 2. Histamine blockers 3. Morphine 4. Atropine 5. Calcium channel blockers A 1,2 & 3 B 1,4 & 5 C 1,2 & 5 D All 💡 Explanation Which of the following drugs cause relaxation of LES? 1. Nitrates 2. Histamine blockers 3. Morphine 4. Atropine 5. Calcium channel blockers ✓ Correct Answer: B. 1,4 & 5