Comparative Pharmacology
Head-to-head clinical analysis: CHLORZOXAZONE versus DANTRIUM.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CHLORZOXAZONE versus DANTRIUM.
CHLORZOXAZONE vs DANTRIUM
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.
Dantrolene inhibits calcium release from the sarcoplasmic reticulum by binding to the ryanodine receptor (RyR1), thereby reducing intracellular calcium concentration and decreasing muscle contraction.
250-500 mg orally 3-4 times daily, maximum 750 mg 4 times daily.
Initially 25 mg orally once daily for 7 days, then 25 mg three times daily for 7 days, then 50 mg three times daily for 7 days, then 100 mg three times daily; maximum 400 mg/day in divided doses. For malignant hyperthermia crisis: IV bolus 1 mg/kg, repeated as needed up to 10 mg/kg cumulative dose.
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: 8.7-14.4 hours in adults; longer with hepatic dysfunction.
Primarily hepatic metabolism followed by renal excretion of metabolites; <1% excreted unchanged in urine; minor biliary/fecal elimination.
Renal: ~65% as unchanged drug; biliary/fecal: ~15% as metabolites; remainder metabolized and eliminated via urine.
Category C
Category C
Skeletal Muscle Relaxant
Skeletal Muscle Relaxant
"The metabolism of Sulfisoxazole can be decreased when combined with Chlorzoxazone."