<P> Muscle relaxants (according to one study) were not advised for orthopedic conditions, but rather for neurological conditions such as spasticity in cerebral palsy and multiple sclerosis . Dantrolene, although thought of primarily as a peripherally acting agent, is associated with CNS effects, whereas baclofen activity is strictly associated with the CNS . </P> <P> 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 . </P> <P> In general, muscle relaxants are not approved by FDA for long - term use . However, rheumatologists often prescribe cyclobenzaprine nightly on a daily basis to increase stage 4 sleep . By increasing this sleep stage, patients feel more refreshed in the morning . Improving sleep is also beneficial for patients who have fibromyalgia . </P> <P> Muscle relaxants such as tizanidine are prescribed in the treatment of tension headaches . </P>

Classes of drugs with smooth muscle relaxant effect