
Some patients may experience transient episodes of light-headedness, dizziness or syncope. Orphenadrine citrate extended-release tablets may impair the ability of the patient to engage in potentially hazardous activities such as operating machinery or driving a motor vehicle; ambulatory patients should therefore be cautioned accordingly.
There is currently no manufacturer warning information available for this drug.
Orphenadrine citrate is indicated as an adjunct to rest, physical therapy, and other measures for the relief of discomfort associated with acute painful musculo skeletal conditions. The mode of action of the drug 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 is the citrate salt of orphenadrine: (2-dimethyl-aminoethyl 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 and has a molecular weight of 461.51. The molecular formula C18H23NO • C6H8O7 is represented by the following structural formula:
Each orphenadrine citrate extended-release tablet contains 100 mg orphenadrine citrate. Orphenadrine citrate extended-release tablets also contain: calcium stearate, ethylcellulose and lactose monohydrate.