• Curr Med Res Opin · Nov 2014

    Randomized Controlled Trial Multicenter Study

    A randomized, double-blind, placebo-controlled 12 week trial of acetaminophen extended release for the treatment of signs and symptoms of osteoarthritis.

    • Mary Jane Prior, Diane D Harrison, and Mary Ellen Frustaci.
    • Medical and Regulatory Sciences, McNeil Consumer Healthcare , Fort Washington, PA , USA.
    • Curr Med Res Opin. 2014 Nov 1;30(11):2377-87.

    ObjectiveDetermine efficacy and safety of acetaminophen extended release (ER) 1300 mg given three times daily compared to placebo for relieving signs and symptoms of hip or knee osteoarthritis.Research Design And MethodsSixty investigators at 58 private, ambulatory, primary care sites in the US enrolled 542 outpatient adults ≥40 years old with moderate to severe idiopathic osteoarthritis pain into a randomized, placebo-controlled, double-blind 12 week clinical trial. Patients were randomly assigned to treatment given three times daily of acetaminophen 1300 mg (n = 267) or placebo (n = 275).ResultsThe three primary endpoints measured through week 12 favored acetaminophen ER as follows: least squares (LS) mean change from baseline for WOMAC physical function subscale score was significantly greater for acetaminophen ER than for placebo (P = 0.011); LS mean patient's global assessment of response to therapy was significantly greater for acetaminophen ER than for placebo (P = 0.010); and LS mean change from baseline for WOMAC pain subscale score was marginally greater for acetaminophen ER than for placebo (P = 0.054). LS mean change from baseline for secondary endpoints through week 12 also favored acetaminophen ER compared with placebo: significantly for WOMAC stiffness subscale score (P = 0.004), significantly for WOMAC total index score (P = 0.013), and marginally for Nottingham Health Profile energy subscale score (P = 0.057). The percentage of patients with any adverse event was similar for both treatment groups. Hepatic transaminases exceeded 3 × ULN in seven acetaminophen ER patients and one placebo patient. Elevations were attributed to health conditions in three of seven acetaminophen ER patients; elevations in the remaining four patients returned to or toward normal.ConclusionsAcetaminophen ER 1300 mg, a nonprescription drug, given three times daily, can provide effective relief of signs and symptoms of osteoarthritis of the hip or knee and was well tolerated. ClinicalTrials.gov registration number: NCT00240799.

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