Patients were randomly assigned to the following groups ( n = 30 each ) : pregabalin group ( P ) , received 150 mg pregabalin capsules 2 hours preoperatively , 12 hours postoperatively , and twice daily for 2 days ; gabapentin group ( G ) , received 1200 mg gabapentin capsules ( 400 mg , 3 ) 2 hours preoperatively , 12 hours postoperatively , and 400 mg three times daily for 2 days ; and control group ( C ) , received placebo capsules .