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Muscle relaxant. This article is about skeletal muscle relaxants. For information on smooth muscle relaxants, see Antispasmodic. A muscle relaxant is a drug that affects skeletal muscle function and decreases the muscle tone. It may be used to alleviate symptoms such as muscle spasms, pain, and hyperreflexia. The term muscle relaxant is used to refer to two major therapeutic groups: neuromuscular blockers and spasmolytics.
Muscle relaxants work by causing the muscles to relax, which reduces pain and discomfort. Baclofen, diazepam, and tizanidine act on the central nervous system (brain and spinal cord). Dantrolene, works directly on the muscle, and cannabis extract works on the brain and spinal cord as well as the muscles.