Analgesic combinations with orphenadrine in oral post-surgical pain.

Two hundred male and female patients underwent a variety of oral surgical procedures and were treated afterwards in four test groups. They took a combination of orphenadrine (25 mg) and acetaminophen (325 mg), either drug alone, or placebo. A double-blind study design was used. All patients had moderately severe baseline pain intensity; post-treatment pain relief was recorded at 30 minutes, one, two, four and six hours. A back-up analgesic (codeine-ASA) was made available if needed. Pain intensity difference (PID) and sums of pain intensity difference (SPID) were calculated using established analgesic study techniques. Statistical analyses indicated better analgesic efficacy in both PID and SPID scores for the orphenadrine-acetaminophen combination over the three other treatments. This was evident at 30 minutes and continued through the sixth hour. Each active drug, in turn, was also significantly better throughout than placebo for pain relief. Sub-groups in each treatment regimen required additional pain relief prior to six hours, with significantly more placebo than orphenadrine-acetaminophen patients needing remedication. Side-effect incidence was very low and randomly distributed among the four groups.