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What is Flexeril?

Flexeril (cyclobenzaprine) is a muscle relaxant. It works by blocking nerve impulses (or sensations) that are sent to your brain.

Flexeril is used together with rest and physical therapy to treat skeletal muscle conditions such as or injury.

Flexeril may also be used for other purposes not listed in this medication guide.

hydrochloride is a white, crystalline tricyclic amine salt with the empirical formula C20H21N•HCl and a molecular weight of 311.9. It has a melting point of 217°C, and a pKa of 8.47 at 25°C. It is freely soluble in water and alcohol, sparingly soluble in isopropanol, and insoluble inhydrocarbon solvents. If aqueous solutions are made alkaline, the free base separates. HCl is designated chemically as 3-(5H -dibenzo[a,d] cyclohepten-5ylidene)-N, N-dimethyl-1-propanamine hydrochloride, and has the following structural formula:

 

FLEXERIL® (Cyclobenzaprine Hcl)  Structural Formula Illustration

FLEXERIL 5 mg ( HCl) is supplied as a 5 mg tablet for oral administration.

FLEXERIL 10 mg ( HCl) is supplied as a 10 mg tablet for oral administration.

FLEXERIL 5 mg ( HCl) tablets contain the following inactive ingredients: lactose hydrous, pre-gelatinized starch, corn starch, stearate, hydroxypropyl cellulose, hypromellose, titanium dioxide, Yellow D&C #10 Aluminum Lake HT, Yellow FD&C #6 Aluminum Lake, and carnauba wax.

FLEXERIL 10 mg ( HCl) tablets contain the following inactive ingredients: lactose hydrous, pre-gelatinized starch, corn starch, stearate, hydroxypropyl cellulose, hypromellose, titanium dioxide, yellow iron oxide, and carnauba wax.

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