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

Coutinho 1976.

Methods RCT, Double blind, single oral dose, parallel groups, local anaesthetic. Assessed by observer at 0, 1/2, 1 hr then hourly for 5 hours. Medication taken when pain of moderate to severe intensity.
Participants Urogenital surgery
 n = 90 (30 relevant patients) 
 Age: adult
Interventions Dextropropoxyphene HCl 65 mg, n = 15 
 Placebo, n = 15
Outcomes PI (4 point scale) standard
 PR (5 point scale) nonstandard
 Dextropropoxyphene was not significantly better than placebo (P not given)
 Mean SPID @ 5 hrs: Dextropropoxyphene :4.5 Placebo: 3.3
Notes Remedication allowed at 4 hours if no pain relief. If remedicated before 4 hours patients were withdrawn from the study.
 There were no exclusions or withdrawals.
 No serious adverse effects were reported & no patients withdrew as a result. 
 Dextropropoxyphene: 1/15 patients reported 1 adverse event 
 Placebo: 0/15
 QS = 4
Risk of bias
Bias Authors' judgement Support for judgement
Allocation concealment? Low risk A ‐ Adequate