Buy Cyclobenzaprine (Flexeril) Cas 303-53-7

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, tiredness, dizziness, and dry mouth.^[5] Serious side effects may include an irregular heartbeat.^[5] There is no evidence of harm in pregnancy, but it has not been well studied in this population.^[5] It should not be used together with MAOIs.^[5] How it works is unclear.^[5] In any case, it is known to inhibit serotonin and norepinephrine reuptake and to block serotonin, adrenergic, histamine, and muscarinic acetylcholine receptors.^[6][7] Chemically, it is very similar to tricyclic antidepressants like amitriptyline.^[6]

Cyclobenzaprine was approved for medical use in the United States in 1977.^[5] It is available by prescription as a generic medication.^[5] In 2023, it was the 47th most commonly prescribed medication in the United States, with more than 13 million prescriptions.^[8][9] It was not available in the United Kingdom as of 2012.^[10]

Cyclobenzaprine is used, in conjunction with physical therapy, to treat muscle spasms that occur because of acute musculoskeletal conditions.^[11] After sustaining an injury, muscle spasms occur to stabilize the affected body part, which may increase pain to prevent further damage. Cyclobenzaprine is used to treat such muscle spasms associated with acute, painful musculoskeletal conditions.^[12] It decreases pain in the first two weeks,^[13][14] peaking in the first few days, but has no proven benefit after two weeks.^[13][15] Since no benefit is proven beyond that, therapy should not be continued long-term.^[12] It is the best-studied muscle relaxer.^[13] It is not useful for spasticity due to neurologic conditions such as cerebral palsy.^[12][16] It may also be used along with other treatments for tetanus.^[17]

Cyclobenzaprine has been found not to be inferior to tizanidine, orphenadrine, and carisoprodol in the treatment of acute lower back pain, although none have been proven to be effective for long-term use (beyond two weeks of treatment). No differences in pain or spasm scores were noted among these agents, nor when compared to benzodiazepines.^[18] However, nonbenzodiazepine (including cyclobenzaprine) treatment was found to have a lower risk of medication abuse and continuation of use against medical advice.^{[medical citation needed]} Side effects such as sedation and ataxia are also less pronounced with nonbenzodiazepine antispasmodics.^{[medical citation needed]}

In a study on the treatment of musculoskeletal pain treatment with cyclobenzaprine alone or in combination with ibuprofen, no significant differences in pain scores were noted among the three treatment groups. Peak benefit was found to occur on day seven of the treatment for all groups.^[19]