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Acute use (1–3 days) yields a potency about 1.5× stronger than that of morphine and chronic use (7 days+) yields a potency about 2.5 to 5× that of morphine. Similarly, the effect of tramadol increases after consecutive dosing due to the accumulation of its active metabolite and an increase of the oral bioavailability in chronic use.
Methocarbamol, sold under the brand name Robaxin among others, is a medication used for short-term musculoskeletal pain. [3] [4] It may be used together with rest, physical therapy, and pain medication. [3] [5] [6] It is less preferred in low back pain. [3] It has limited use for rheumatoid arthritis and cerebral palsy.
Absorption/distribution: The oral formulation can be absorbed from the gastrointestinal tract and remain 20–50% bound to plasma proteins. [15] The onset of analgesia is about 20 to 30 minutes with a duration of 4 to 8 hours and t 1/2 of 3 to 4 hours. [15] Maximum serum levels are achieved at 1.3 hours. [1]
Other skeletal muscle relaxants of that type used around the world come from a number of drug categories and other drugs used primarily for this indication include orphenadrine (anticholinergic), chlorzoxazone, tizanidine (clonidine relative), diazepam, tetrazepam and other benzodiazepines, mephenoxalone, methocarbamol, dantrolene, baclofen. [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 ]
OTC generic formulations with ibuprofen or acetaminophen are generally cheaper, e.g. $0.40-.65 CAD for the 500 mg formulation with ibuprofen, quantity 40-100. For comparison, the US online retail cost for generic methocarbamol 750-mg (not available in Canada) ranges from about $0.20 to $0.40 USD per tablet in a quick check.
Celexa – an antidepressant of the SSRI class; Centrax – an anti-anxiety agent; Clozaril – atypical antipsychotic used to treat resistant schizophrenia; Concerta (methylphenidate) – an extended release form of methylphenidate
The usual dose of 350 mg is unlikely to engender prominent side effects other than somnolence, and mild to significant euphoria or dysphoria, but the euphoria is generally short-lived due to the fast metabolism of carisoprodol into meprobamate and other metabolites; the euphoria derived is, according to new research, [11] most likely due to carisoprodol's inherent, potent anxiolytic effects ...