Comparative Pharmacology
Head-to-head clinical analysis: CHLORZOXAZONE versus TRANCOPAL.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CHLORZOXAZONE versus TRANCOPAL.
CHLORZOXAZONE vs TRANCOPAL
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Chlorzoxazone acts centrally on the spinal cord and subcortical areas of the brain to inhibit multisynaptic reflex arcs involved in producing and maintaining muscle spasm. It may also have some sedative effects.
Trancopal (chlormezanone) is a centrally acting muscle relaxant and anxiolytic. Its exact mechanism is not fully understood, but it is believed to act on the central nervous system by depressing polysynaptic reflexes and possibly through GABAergic modulation.
250-500 mg orally 3-4 times daily, maximum 750 mg 4 times daily.
200-400 mg orally every 6 hours as needed for acute musculoskeletal pain; maximum 1.6 g per day.
None Documented
None Documented
Clinical Note
moderateChlorzoxazone + Fluticasone propionate
"The risk or severity of adverse effects can be increased when Chlorzoxazone is combined with Fluticasone propionate."
Clinical Note
moderateChlorzoxazone + Haloperidol
"The metabolism of Haloperidol can be decreased when combined with Chlorzoxazone."
Clinical Note
moderateChlorzoxazone + Tenofovir disoproxil
"The metabolism of Tenofovir disoproxil can be decreased when combined with Chlorzoxazone."
Clinical Note
moderateChlorzoxazone + Sulfisoxazole
Terminal elimination half-life approximately 1–2 hours; clinically relevant for muscle relaxant effect duration.
Terminal elimination half-life: 20-30 hours in healthy adults. Prolonged in hepatic impairment (up to 60 hours).
Primarily hepatic metabolism followed by renal excretion of metabolites; <1% excreted unchanged in urine; minor biliary/fecal elimination.
Primarily renal: ~95% as metabolites (glucuronides, sulfate conjugates) with <1% unchanged. Fecal: <5%.
Category C
Category C
Skeletal Muscle Relaxant
Skeletal Muscle Relaxant
"The metabolism of Sulfisoxazole can be decreased when combined with Chlorzoxazone."