Comparative Pharmacology
Head-to-head clinical analysis: CHLORZOXAZONE versus METAXALONE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CHLORZOXAZONE versus METAXALONE.
CHLORZOXAZONE vs METAXALONE
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.
Metaxalone is a centrally acting muscle relaxant whose exact mechanism is unknown. It is thought to produce skeletal muscle relaxation by depressing the central nervous system (CNS), possibly through general CNS depression or by blocking polysynaptic reflexes in the spinal cord.
250-500 mg orally 3-4 times daily, maximum 750 mg 4 times daily.
800 mg orally 3 to 4 times daily
MODERATE Risk
MODERATE Risk
Terminal elimination half-life approximately 1–2 hours; clinically relevant for muscle relaxant effect duration.
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 is approximately 0.5 to 1.5 hours, reflecting rapid clearance and supporting short-lived clinical effects.
Primarily hepatic metabolism followed by renal excretion of metabolites; <1% excreted unchanged in urine; minor biliary/fecal elimination.
Primarily renal; approximately 90% of a dose is excreted in urine as glucuronide conjugates and unchanged drug, with less than 1% eliminated in feces via biliary excretion.
Category C
Category A/B
Skeletal Muscle Relaxant
Skeletal Muscle Relaxant
"The metabolism of Sulfisoxazole can be decreased when combined with Chlorzoxazone."