Background: Spinal anesthesia is most commonly preferred anesthesia types in the clinicalrnpractice. Post Spinal Anesthesia Shivering (PSAS) is one of the frequent side effects of spinalrnanesthesia and results in ill patient outcome. It occurs during both general and spinal anesthesia,rnbut it is more cumbersome during spinal anesthesia. From many approaches tried to overcomernthis problem; non-pharmacological one is supper effective in prevention of PSAS. But it is veryrncostly and not applicable in all settings. The pharmacological approach is more commonly usedrnand is accessible in almost all settings.rnObjective: The objective of the study was to compare the therapeutic effect of meperidine andrnTramadol in control of PSAS during elective cescerean section in parturient who gave birth underrnspinal anesthesia, in the quest for a drug with more efficacy and less side effects.rnMethods and Materials: In this prospective cohort study 74 parturients of ASA I and II whornunderwent elective cescerean delivery under spinal anesthesia and developed PSAS at GandhirnMemorial Hospital from Dec 1, 2016-Feb 28, 2017 were included. Parturients were treated withrneither Meperidine 0.5 mg/kg (n=37) Tramadol 0.5mg/kg (n=37) depending on inclusion criteria.rnTime from treatment to cessation of PSAS in minutes, Hemodynamic variables before spinalrnanesthesia (baseline), after spinal anaesthesia, at 5,10 and 30 minutes after PSAS was treated wererntaken. Reoccurrence of PSAS and therapeutic side effects were recorded.rnData were entered into Epi info version 7 and exported to SPSS version 20 for analysis.rnDifferences of Categorical data were analyzed with the Chi-Square test. Numerical data betweenrngroups were evaluated using independent samples t-test or Mann-Whitney U test. A p value ofrn