Evaluation of Aspirin, Caffeine, and Their Combination in Postoperative Oral Surgery Pain

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Abstract
Three hundred fifty outpatients with postoperative pain after the surgical removal of impacted third molars were randomly assigned, on a double-blind basis, to receive a single oral dose of aspirin 650 or 1000 mg, caffeine 65 mg, a combination of aspirin 650 mg with caffeine 65 mg, or placebo. Using a self-rating record, subjects rated their pain and its relief hourly for 6 hours after medicating. Estimates of summed pain intensity difference, peak pain intensity difference, total relief, peak relief, and hours of 50% relief were derived from these subjective reports. All active treatments except caffeine were significantly superior to placebo. Pairwise comparisons indicated the aspirin-caffeine combination was statistically superior to aspirin 650 mg alone for hours of 50% relief among patients who had severe baseline pain. Adverse effects were transitory and none were serious.

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