Methods	Randomised, double blind, parallel group. Single oral dose
Participants	Adult patients undergoing hip arthroplasty. Mean age 68 years
Interventions	Pregabalin 300 mg, n = 42 Pregabalin 300 mg + dexamethasone 8 mg, n = 42 Placebo, n = 42
Outcomes	24-hour postoperative morphine consumption, with pain scores at rest and on activity
Notes	Oxford quality score: R2, D2, W1 = 5/5 No pregabalin-related sponsorship mentioned
Risk of bias
Item	Authors’ judgement	Description
Adequate sequence generation?	Yes	“computer generated block randomisation”
Allocation concealment?	Yes	“no person was aware of assignment”
Blinding? All outcomes	Yes	“identical capsules”