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. 1999 Jan 25;1999(1):CD001440. doi: 10.1002/14651858.CD001440

Evans 1982.

Methods RCT, Double blind, single oral dose, parallel groups, general anaesthetic. Assessed by same nurse observer at 0, 1/2, 1 hr then hourly for 4 hrs. Medication given when pain of moderate to severe intensity.
Participants Minor orthopaedic surgery
 n = 120 
 Age: Adult
Interventions Dextropropoxyphene HCl 65 mg + paracetamol 650 mg, n = 30
 Placebo, n = 30
Outcomes PI (4 point scale) standard 
 PR (5 point scale) standard
 Dextropropoxyphene + paracetamol was significantly better than placebo (P < 0.05) for TOTPAR
 4 hr TOTPAR: Dextropropoxyphene + paracetamol: 7.37 Placebo: 4.70
Notes If remedicated before 4 hrs, last PI and PR score prior to remedication were used for all further time points.
 120 participants data were analysed. No withdrawals were reported.
 No serious adverse events were reported & no patients withdrew as a result. 
 Dextropropoxyphene + paracetamol: 16/30 patients reported 16 adverse events. 
 Placebo: 13/30 patients reported 13 adverse events.
 QS = 3
Risk of bias
Bias Authors' judgement Support for judgement
Allocation concealment? Low risk A ‐ Adequate