Methods	Randomised, double blind, parallel group. Single oral dose
Participants	Laparoscopic gynaecological surgery. Mean age 36 years
Interventions	Pregabalin 75 mg, n = 30 Pregabalin 150 mg, n = 30 Diazepam 5 mg, n = 30 all in addition to ibuprofen 800 mg
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”