Medically reviewed on September 19, 2016
What is Amrix?
Amrix is a muscle relaxant. It works by blocking nerve impulses (or pain sensations) that are sent to your brain.
Amrix is used together with rest and physical therapy to treat skeletal muscle conditions such as pain or injury.
Amrix may also be used for purposes not listed in this medication guide.
Before taking this medicine
Do not use Amrix if you have taken an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include isocarboxazid, linezolid, phenelzine, rasagiline, selegiline, and tranylcypromine.
You should not use Amrix if you are allergic to it, or if you have:
a heart rhythm disorder, or you have recently had a heart attack;
congestive heart failure;
heart block; or
a thyroid disorder.
To make sure Amrix is safe for you, tell your doctor if you have:
Older adults may be more sensitive to the side effects of Amrix.
Amrix is not expected to harm 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. Tell your doctor if you are breast-feeding a baby.
How should I take Amrix?
Amrix is usually taken once daily for only 2 or 3 weeks. Follow all directions on your prescription label. Do not take this medicine in larger or smaller amounts or for longer than recommended.
Take the medicine at the same time each day.
Do not crush, chew, break, or open an extended-release capsule. Swallow it whole.
You may have unpleasant withdrawal symptoms when you stop taking Amrix after long-term use. Ask your doctor how to avoid withdrawal symptoms when you stop using this medicine.
Amrix 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 at room temperature away from moisture, heat, and light.
What happens if I miss a dose?
Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222. An overdose of Amrix can be fatal.
What should I avoid while taking cyclobenzaprine?
This medication may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert.
Avoid drinking alcohol. Dangerous side effects could occur.
Amrix side effects
Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Stop using Amrix and call your doctor at once if you have:
severe drowsiness, fast heart rate;
tremors or shaking;
pounding heartbeats or fluttering in your chest; or
Common side effects may include:
drowsiness, tired feeling;
blurred vision, dry mouth or throat, altered sense of taste; or
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
See also: Side effects (in more detail)
What other drugs will affect Amrix?
Taking Amrix with other drugs that make you sleepy or slow your breathing can cause dangerous or life-threatening side effects. Ask your doctor before taking a sleeping pill, narcotic pain medicine, prescription cough medicine, a muscle relaxer, or medicine for anxiety, depression, or seizures.
This list is not complete. Other drugs may interact with cyclobenzaprine, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide.
Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
Copyright 1996-2018 Cerner Multum, Inc. Version: 4.03.
More about Amrix (cyclobenzaprine)
- Amrix Side Effects
- During Pregnancy or Breastfeeding
- Dosage Information
- Drug Images
- Drug Interactions
- Support Group
- Pricing & Coupons
- En Español
- 32 Reviews
- Drug class: skeletal muscle relaxants