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We compared an acetaminophen (paracetamol) 1 g (n = 51) formulation for infusion with propacetamol 2 g (n = 51) and placebo (n = 50) in a randomized, controlled, double-blind, parallel group trial in patients with moderate-to-severe pain after third molar surgery. Treatment efficacy was assessed in house for 6 h after starting the 15-min infusion. Significant effects versus placebo (P &lt; 0.01) were obtained with both active treatments on pain relief, pain intensity difference on a 100-mm visual analog scale, and on a categorical scale (except for propacetamol at 6 h). No significant differences were noted between active groups except at 1 h. Six-hour weighted sums of primary assessments showed significantly better efficacy than placebo (P &lt; 0.0001) and no difference between active treatments. Median stopwatch time to onset of pain relief for active treatment was 6-8 min after infusion start. Active treatments showed comparable efficacy with a significantly longer duration of analgesia and better patients' global evaluation compared with placebo. The incidence of patients reporting local pain at the infusion site was significantly less frequent after IV acetaminophen or placebo (0%) in comparison with propacetamol (49%). In conclusion, acetaminophen 1 g and propacetamol 2 g were superior to placebo regarding analgesic efficacy, with a more frequent incidence of local pain at the infusion site for propacetamol.

anesthesia and analgesia/anesthesia and analgesia

Intravenous Acetaminophen (Paracetamol): Comparable Analgesic Efficacy, but Better Local Safety than Its Prodrug, Propacetamol, for Postoperative Pain After Third Molar Surgery