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FLEXERIL tablets contain the following inactive ingredients: hydroxypropyl cellulose, hydroxypropyl methylcellulose, iron oxide, lactose, magnesium stearate, starch, and titanium dioxide. FLEXERIL 5 mg tablets also contain Yellow D&C #10 Aluminum Lake HT, and Yellow FD&C #6 Aluminum Lake. CLINICAL PHARMACOLOGY Cyclobenzaprine HCl relieves skeletal muscle spasm of local origin without interfering with muscle function. It is ineffective in muscle spasm due to central nervous system disease.
As an estimate then , after taking a dose of Flexeril it should be out of your system within 5.5 days to 16.5 days. However other factors to consider include: 1. How much and how often you have taken the drug. 2. Your metabolic rate â a slower metabolism will increase the time a drug remains in your system. 3.