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An equianalgesic chart is a conversion chart that lists equivalent doses of analgesics (drugs used to relieve pain). Equianalgesic charts are used for calculation of an equivalent dose (a dose which would offer an equal amount of analgesia) between different analgesics. [1]
ATC code M03 Muscle relaxants is a therapeutic subgroup of the Anatomical Therapeutic Chemical Classification System, a system of alphanumeric codes developed by the World Health Organization (WHO) for the classification of drugs and other medical products.
The clinical effectiveness of methocarbamol compared to other muscle relaxants is not well known. [12] One trial of methocarbamol versus cyclobenzaprine, a well-studied muscle relaxant, in those with localized muscle spasm found there were no significant differences in their effects on muscle spasm, limitation of motion, or limitation of daily activities.
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] It is taken by mouth. [5] Common side effects include headache, feeling tired, dizziness, and dry mouth. [5]
Effectiveness has not been clearly shown for metaxalone, methocarbamol, chlorzoxazone, baclofen, or dantrolene. [7] Applicable conditions include acute back [8] or neck pain, or pain after an injury. Long-term use of muscle relaxants in such cases is poorly supported. [8]
Baclofen, sold under the brand name Lioresal among others, is a medication used to treat muscle spasticity, such as from a spinal cord injury or multiple sclerosis. [8] [9] It may also be used for hiccups and muscle spasms near the end of life, [9] and off-label to treat alcohol use disorder [10] [11] or opioid withdrawal symptoms. [12]
In cats, methocarbamol is an important medication in the treatment of permethrin poisoning (which occurs when canine permethrin flea products are used inadvertantly on pet cats.) An oral dose of methocarbamol is active in the body approximately 30 minutes after administration with activity peaking in 2 hours (in humans).