 This study is a clinical trial, prospective, randomized and double-blinded. Gabapentin oral 10 mgkg was administered to reduce the pain intensity as well as the opioid consumption in children from 3 months to 16 years submitted unilateral limb surgery. The children were divided into 2 groups: the gabapentin group GG was administered gabapentin 1 to 2 hours before procedure N-40 and the placebo group GP was administered placebo 1 to 2 hours before surgery N-44. Both groups were subjected to the same general anesthesia protocol, opioid free, and femoral and sciatic block with bupivacaine 0.125. All patients received dipyrone and rescue analgesic used was morphine into 22h. The variables studied were age, gender, weight, type of surgery, hemodynamics, postoperative pain and morphine consumption . 