Methods	Randomised, double blind, parallel group
Participants	Women undergoing laparoscopic hysterectomy. Mean age 50 years
Interventions	Diazepam 10 mg, n = 30 pregabalin 150 mg, n = 30 pregabalin 300 mg, n = 30 All given 1 hour preoperatively, and 12 hours later, when placebo was given to those initially given diazepam, and pregabalin 150 mg or 300 mg to those initially given pregabalin 150 mg or 300 mg (24 hr study)
Outcomes	Postoperative pain using 11-point numerical rating scale
Notes	Oxford quality score: R2, D2, W1 = 5/5 HUCH-EVO Committee and Paulo Foundation sponsored
Risk of bias
Item	Authors’ judgement	Description
Adequate sequence generation?	Yes	“computer generated random number table”
Allocation concealment?	Yes	“opaque containers”
Blinding? All outcomes	Yes	“identical capsules”