Patients were randomly assigned to the following groups ( n = @ each ) : pregabalin group ( P ) , received @ mg pregabalin capsules @ hours preoperatively , @ hours postoperatively , and twice daily for @ days ; gabapentin group ( G ) , received @ mg gabapentin capsules ( @ mg , @ ) @ hours preoperatively , @ hours postoperatively , and @ mg three times daily for @ days ; and control group ( C ) , received placebo capsules .