Preclinical Research The aim of the present study was to evaluate the antinociceptive interaction between naproxen and the glycoside flavonoid, rutin in the acetic acid-induced writhing test in mice. Naproxen (5, 20, 50, and 100 mg/kg p.o.) or rutin (10, 25, 50, and 100mg/kg p.o.) were administered 60 min before the intraperitoneal administration with acetic acid. The dose-response curve of each individual compound and the experimental effective dose 50 (ED ) value were obtained to determinate different proportions of the combinations between the two compounds (naproxen-rutin 1:1, 3:1, and 3:1) in the writhing test. The results indicated a synergistic antinociceptive interaction between two drugs with different mechanism of action, naproxen and rutin in all the combinations. Drug Dev Res 78 : 184-188, 2017. © 2017 Wiley Periodicals, Inc.
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