Flexeril 5mg


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What is Flexeril?

Flexeril 5mg is a prescription medicine and is used to treat the symptoms of muscle spasms. Flexeril may be used alone or with other medications.

It belongs to a class of drugs called Skeletal Muscle Relaxants.

What are the possible side effects of Flexeril?

In fact Flexeril 5mg may cause serious side effects including:

  • fast or irregular heartbeat,
  • chest pain or pressure,
  • pain spreading to your jaw or shoulder,
  • sudden numbness or weakness (especially on one side of the body),
  • slurred speech, and
  • balance problems, etc.

It is equally important to get medical help right away, if you have any of the symptoms listed above.

Equally important the most common side effects of Flexeril include:

  • drowsiness,
  • tiredness,
  • headache,
  • dizziness,
  • dry mouth,
  • upset stomach,
  • nausea, and
  • constipation etc.

Moreover tell the doctor if you have any side effect that bothers you not only-but also that does not go away.

Also these are not all the possible side effects of Flexeril. For more information, ask your doctor or pharmacist.

Consequently call your doctor for medical advice about side effects. In the same way you may report side effects to FDA at 1-800-FDA-1088.


Cyclobenzaprine hydrochloride is a white and crystalline tricyclic amine salt with the empirical formula C20H21N•HCl and a molecular weight of 311.9.Futhermore, 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 and in the same way sparingly soluble in isopropanol, and insoluble in hydrocarbon solvents.  Cyclobenzaprine HCl is similarly  designated chemically as 3-(5H-dibenzo[a,d] cyclohepten-5-ylidene)-N, Ndimethyl- 1-propanamine hydrochloride, and has the following structural formula:



FLEXERIL® (Cyclobenzaprine hydrochloride) Structural Formula Illustration


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.

Additional information


60, 90, 120, 180


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