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Muscle relaxants are thought to be useful in painful disorders based on the theory that pain induces spasm and spasm causes pain. However, considerable evidence contradicts this theory. [17] In general, muscle relaxants are not approved by FDA for long-term use.
Eperisone (formulated as the eperisone hydrochloride salt) is an antispasmodic drug.. Eperisone acts by relaxing both skeletal muscles and vascular smooth muscles, and demonstrates a variety of effects such as reduction of myotonia, improvement of circulation, and suppression of the pain reflex.
Mephenesin (), also called myanesin, [1] [2] is a centrally acting muscle relaxant.It can be used as an antidote for strychnine poisoning.Mephenesin however presents with the major drawbacks of having a short duration of action and a much greater effect on the spinal cord than the brain, resulting in pronounced respiratory depression at clinical doses and therefore a very low therapeutic index.
Metaxalone, sold under the brand name Skelaxin, is a muscle relaxant medication used to relax muscles and relieve pain caused by strains, sprains, and other musculoskeletal conditions. [1] Its exact mechanism of action is not known, but it may be due to general central nervous system depression . [ 1 ]
Common side effects include headaches, sleepiness, and dizziness. [3] [8] Serious side effects may include anaphylaxis, liver problems, confusion, and seizures. [4] Use is not recommended in pregnancy and breastfeeding. [3] [4] Because of the risk of injury, skeletal muscle relaxants should generally be avoided in geriatric patients. [3]
Cyclobenzaprine, sold under several brand names including, historically, Flexeril, is a muscle relaxer used for muscle spasms from musculoskeletal conditions of sudden onset. [5] It is not useful in cerebral palsy. [5] It is taken by mouth. [5] Common side effects include headache, feeling tired, dizziness, and dry mouth. [5]