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Norflex (Orphenadrine Citrate) - Description and Clinical Pharmacology

 
 



Norflex™
(orphenadrine citrate)
EXTENDED-RELEASE TABLETS AND INJECTION

DESCRIPTION

Orphenadrine citrate is the citrate salt of orphenadrine (2-dimethylaminoethyl 2- methylbenzhydryl ether citrate). It occurs as a white, crystalline powder having a bitter taste. It is practically odorless; sparingly soluble in water, slightly soluble in alcohol.

Each Norflex Extended-release Tablet contains 100 mg orphenadrine citrate. Norflex Extended-release Tablets also contain: calcium stearate, ethylcellulose, and lactose. Norflex Injection contains 60 mg of orphenadrine citrate in aqueous solution in each ampul. Norflex Injection also contains: sodium bisulfite NF, 2.0 mg; sodium chloride USP, 5.8 mg; sodium hydroxide, to adjust pH; and water for injection USP, q.s. to 2 mL.

CLINICAL PHARMACOLOGY

The mode of therapeutic action has not been clearly identified, but may be related to its analgesic properties. Orphenadrine citrate does not directly relax tense skeletal muscles in man. Orphenadrine citrate also possesses anti-cholinergic actions.

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