Flexeril

Generic Name: cyclobenzaprine (sye kloe BEN za preen)
Brand Names: Amrix, Fexmid, Flexeril

What is Flexeril?

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

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

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

Important information

Do not take Flexeril if you have used an MAO inhibitor such as isocarboxazid (Marplan), tranylcypromine (Parnate), phenelzine (Nardil), or selegiline (Eldepryl, Emsam) within the past 14 days. Serious, life-threatening side effects can occur if you take Flexeril before the MAO inhibitor has cleared from your body.

 Flexeril (cyclobenzaprine): How to Safely Use This Muscle Relaxant

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Flexeril (cyclobenzaprine): How to Safely Use This Muscle Relaxant

You should not take Flexeril if you have recently had a heart attack, or if you have a heart rhythm disorder, congestive heart failure, heart block, or an overactive thyroid.

Flexeril can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert. Avoid drinking alcohol, which can increase some of the side effects of Flexeril.

Before taking this medicine

Do not take Flexeril if you have used an MAO inhibitor such as isocarboxazid (Marplan), tranylcypromine (Parnate), phenelzine (Nardil), or selegiline (Eldepryl, Emsam) within the past 14 days. Serious, life-threatening side effects can occur if you take Flexeril before the MAO inhibitor has cleared from your body. Do not use Flexeril if you have recently had a heart attack, or if you have:

a heart rhythm disorder;

congestive heart failure;

heart block; or

an overactive thyroid.

Before using Flexeril, tell your doctor if you are allergic to any drugs, or if you have:

problems with urination;

enlarged prostate;

glaucoma; or

liver disease.

If you have any of these conditions, you may need a dose adjustment or special tests to safely take Flexeril.

FDA pregnancy category B. Flexeril is not expected to be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment. It is not known whether cyclobenzaprine passes into breast milk or if it could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.

See also: Pregnancy and breastfeeding warnings (in more detail)

Older adults may be more sensitive to the side effects of Flexeril.

How should I take Flexeril?

Take this medication exactly as it was prescribed for you. Do not take Flexeril in larger amounts, or take it for longer than recommended by your doctor. Follow the directions on your prescription label.

Take this medicine with a full glass of water.

Flexeril is only part of a complete program of treatment that may also include rest, physical therapy, or other pain relief measures. Follow your doctor's instructions.

Store Flexeril at room temperature away from moisture, heat, and light.

See also: Dosage Information (in more detail)

What happens if I miss a dose?

Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and take the medicine at the next regularly scheduled time. Do not take extra medicine to make up the missed dose.

What happens if I overdose?

Seek emergency medical attention if you think you have used too much of this medicine. An overdose of Flexeril can be fatal.

Overdose symptoms may include drowsiness, fast heartbeat, tremors or shaking, slurred speech, confusion, nausea, vomiting, hallucinations (seeing things), chest pain, or seizure (convulsions).