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Norgesic

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Norgesic

CLINICAL PHARMACOLOGY

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Orphenadrine citrate is a centrally acting (brain stem) compound which in animals selectively blocks facilitatory functions of the reticular formation. Orphenadrine does not produce myoneural block, nor does it affect crossed extensor reflexes. Orphenadrine prevents nicotine-induced convulsions but not those produced by strychnine.

Chronic administration of Norgesic (orphenadrine citrate with aspirin and caffeine) to dogs and rats has revealed no drug-related toxicity. No blood or urine changes were observed, nor were there any macroscopic or microscopic pathological changes detected. Extensive experience with combinations containing aspirin and caffeine has established them as safe agents. The addition of orphenadrine citrate does not alter the toxicity of aspirin and caffeine.

The mode of therapeutic action of orphenadrine has not been clearly identified, but may be related to its analgesic properties.

Orphenadrine citrate also possesses anticholinergic actions.

Last reviewed on RxList: 4/7/2009
This monograph has been modified to include the generic and brand name in many instances.

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