What is the most important information I should know about cyclobenzaprine?

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Do not stop taking cyclobenzaprine suddenly if you have been taking it regularly for more than 1 week. This may cause nausea, headache and general discomfort.

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Use alcohol cautiously. Alcohol may increase drowsiness and dizziness while you are taking cyclobenzaprine.

What is cyclobenzaprine?

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

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Cyclobenzaprine is used to relieve pain, tenderness, and limitation of motion caused by muscle spasms. It is used, along with rest and physical therapy, for short-term treatment (i.e., 2 to 3 weeks).

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Cyclobenzaprine may also be used for purposes other than those listed in this medication guide.

Who should not take cyclobenzaprine?

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Do not take cyclobenzaprine if you

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have recently (within the last 6 weeks) had a heart attack,

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have irregular heartbeats,

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have a heart block,

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have heart conduction disturbance,

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have congestive heart failure, or

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have hyperthyroidism that is not under control.

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Before taking this medication, tell your doctor if you have

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urinary retention or

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narrow-angle glaucoma or increased intraocular pressure (pressure inside the eye).

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You may need a lower dose or special monitoring during treatment if you have any of the conditions listed above.

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Cyclobenzaprine is in the FDA pregnancy B. This means that it is unlikely to harm an unborn baby. Do not take cyclobenzaprine without first talking to your doctor if you are pregnant.

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It is not known whether cyclobenzaprine passes into breast milk. Do not take cyclobenzaprine without first talking to your doctor if you are breast-feeding a baby.

How should I take cyclobenzaprine?

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Take cyclobenzaprine exactly as directed by your doctor. If you do not understand these instructions, ask your pharmacist, nurse, or doctor to explain them to you.

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Take each dose with a full glass of water.

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Cyclobenzaprine is usually taken several times a day. Follow your doctor's instructions.

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You should begin to notice relief from your symptoms after 1 to 2 days of treatment.

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Do not stop taking cyclobenzaprine suddenly if you have been taking it regularly for more than 1 week. Stopping suddenly may cause nausea, headache, and general discomfort.

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Store cyclobenzaprine at room temperature away from moisture and heat.

What happens if I miss a dose?

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Take the missed dose as soon as you remember. However, if it is almost time for your next dose, skip the dose you missed and take your next regularly scheduled dose. Do not take a double dose of this medication.

What happens if I overdose?

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Seek emergency medical attention.

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Symptoms of a cyclobenzaprine overdose include drowsiness, seizures, irregular heartbeats, hallucinations, and difficulty breathing.

What should I avoid while taking cyclobenzaprine?

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Use caution when driving, operating machinery, or performing other hazardous activities. Cyclobenzaprine may cause dizziness or drowsiness. If you experience dizziness or drowsiness, avoid these activities.

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Use alcohol cautiously. Alcohol may increase drowsiness and dizziness while you are taking cyclobenzaprine.

What are the possible side effects of cyclobenzaprine?

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If you experience any of the following serious side effects, stop taking cyclobenzaprine and seek emergency medical attention:

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an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives);

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seizures, hallucinations, or confusion;

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blurred vision;

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increased heart rate; or

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depression.

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Other, less serious side effects may be more likely to occur. Continue to take cyclobenzaprine and talk to your doctor if you experience

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drowsiness or dizziness;

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dry mouth or a bad taste in your mouth;

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insomnia;

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difficulty urinating; or

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sweating.

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If you stop taking this medication suddenly, you may experience some withdrawal effects.

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Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.