Amrix is used for relieving muscle spasms caused by injury or other muscle problems. It comes in an extended-release capsule that prolongs the effects of the medication and is currently the only muscle relaxant approved for once-daily use. Healthcare providers may occasionally recommend off-label Amrix uses as well, such as for treating fibromyalgia pain and for helping people sleep.
Amrix® (cyclobenzaprine ER) is a prescription medication used to treat muscle spasms. It is a long-acting muscle relaxant that is taken just once a day. Currently, it is the first and only muscle relaxant approved for once-daily use.
Muscle spasms are involuntary contractions of muscles. Muscle spasms can cause stiffness, pain, and tenderness. Muscle spasms are a frequent cause of back pain, and sometimes muscles spasms in the neck can cause headaches. Typically, muscle spasms are caused by overuse, injury, or similar problems (like sleeping in a strange position). Amrix usually works quite well for these types of muscle spasms. However, some people have muscle spasms due to problems in the brain or spinal cord, such as with cerebral palsy or spinal cord injury. Amrix is not very effective for these types of muscle spasms.
Amrix is approved for short-term use, generally for only two to three weeks at a time. This should be adequate time to allow any muscle injury or damage to heal. If you feel that the problem has not sufficiently improved after two or three weeks, check with your healthcare provider. You may have an ongoing problem that needs to be treated differently.
Amrix is not approved for use in elderly individuals (those older than 65 years of age), as studies suggest that elderly people cannot clear Amrix from the body as well as younger people.