<prompt> Treatment in post operative shivering?PethidinePiritramideMethadonePentazocine  <response>: Ans. is a i.e., Pethidine Post-anaesthesia shivering PAS Post anaesthesia post operative shivering occurs in 40 of patients recovering from general anaesthesia. Some time it is preceded by central hypothermia and peripheral vasoconstriction, indicating that it is a thermoregulatory mechanism Pethidine is most effective drug for treatment of PAS. Other drugs used are --clonidine, doxapram, ketanserin, alfentonil, butorphanol, chlorpromazine. 