Abstract
Orphenadrine, a muscle relaxant with antinociceptive effects, was shown to increase and prolong the antinociceptive effects of paracetamol in mice. Both in the increasing temperature hot plate test and in the formalin test, a combination of the two drugs showed a significantly improved effect compared to either of the drugs alone. The time course of the effects was tested in the increasing temperature hot plate test. The group treated with the drug combination showed a prolonged effect compared to both single drug treated groups, the effect lasting longer than 120 min. for the combination and about 80 min. for the single drugs. Orphenadrine and paracetamol increased antinociception even when orphenadrine was injected 90 min. after paracetamol, which by that time did not exert antinociceptive effects by itself. Thus the combination of orphenadrine and paracetamol enhances the antinociceptive effect of either drug in mice.
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