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What is muscle spasm?

Muscle spasm is an unexpected and involuntary contraction, or tightening, of a muscle or a group of muscles. If you touch the skin over a muscle spasm, the muscle might feel like it is clenched in a hard knot. Muscle spasm often results from an injury, and may come with pain and tenderness. The pain, in turn, often causes more spasm. Muscle spasm often limits movement and limits activity.

Muscle spasm associated with acute painful conditions, such as low back or neck strains, usually doesn't last very long — typically no more than two to three weeks — however, muscle spasm may come back.

Painful muscle spasm can disrupt your life for a few days or a few weeks. It is important to understand the causes and learn about treatment options that can help control muscle spasm, relieve pain and tenderness, and improve movement.

AMRIX® (Cyclobenzaprine Hydrochloride Extended-Release Capsules) is a prescription medicine to be used along with rest and physical therapy to help control muscle spasm associated with acute, painful musculoskeletal conditions. AMRIX should only be taken for short periods (up to two or three weeks). It should be taken at about the same time each day.

Certain medicines may cause serious or potentially life-threatening consequences when taken in combination with AMRIX, so tell your doctor if you are taking any medicines.

You should not use AMRIX if you:

  • Are sensitive to any of its ingredients
  • Are taking certain antidepressants, such as monoamine oxidase inhibitors (MAOIs)
  • Are 65 years old or older
  • Have liver problems
  • Have certain types of heart problems
  • Have an overactive thyroid

Before taking AMRIX, talk to your doctor about all of your medical conditions, including any history of heart problems, urinary problems, or glaucoma.

AMRIX may affect your ability to perform certain hazardous tasks, such as operating machinery or driving a motor vehicle, especially when used with alcohol or other sedatives.

Side effects of AMRIX may include dry mouth, dizziness, fatigue, nausea, upset stomach, constipation, and drowsiness. Click here for full Prescribing Information.

AMRIX is distributed by Cephalon and produced with Eurand Diffucaps® technology. For more information about AMRIX, please call Cephalon at 1-800-896-5855.