Sildenafil increases diclofenac antinociception in the formalin test
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The antinociceptive activity of an inhibitor of phosphodiesterase 5, alone or combined with diclofenac, was assessed in the formalin test. Local administration of diclofenac produced a significant antinociception in both phases of the formalin test in female Wistar rats. In contrast, 1-[4-ethoxy-3-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo [3,4-d]pyrimidin-5-yl)phenylsulfonyl]-4-methyl piperazine (sildenafil, an inhibitor of phosphodiesterase 5) produced significant antinociception, only during the second phase of the formalin test. Non-effective doses of sildenafil (25-100 μg/paw) significantly increased the antinociceptive effect of an inactive dose of diclofenac (25 μg) in both phases of the test. The antinociception produced by the drugs alone or the combination was due to a local action, as its administration in the contralateral paw was ineffective. Since sildenafil is a potent and selective inhibitor of phosphodiesterase 5, our results suggest that this drug produced its antinociceptive activity, and increased that of diclofenac, probably through the inhibition of cyclic GMP degradation. © 2001 Published by Elsevier Science B.V.
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Antinociception; cGMP; Diclofenac; Sildenafil; Synergism cyclic GMP; diclofenac; formaldehyde; phosphodiesterase inhibitor; phosphodiesterase V inhibitor; sildenafil; unclassified drug; animal experiment; antinociception; article; controlled study; dose response; drug activity; drug effect; drug efficacy; drug mechanism; drug potentiation; female; hindlimb; nonhuman; nucleic acid metabolism; priority journal; rat; Analgesics; Animals; Cyclooxygenase Inhibitors; Diclofenac; Dose-Response Relationship, Drug; Drug Synergism; Enzyme Inhibitors; Female; Formaldehyde; Pain; Pain Measurement; Phosphodiesterase Inhibitors; Piperazines; Rats; Rats, Wistar
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