Comparative Pharmacology
Head-to-head clinical analysis: CHLORZOXAZONE versus RYANODEX.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CHLORZOXAZONE versus RYANODEX.
CHLORZOXAZONE vs RYANODEX
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.
Ryanodine receptor agonist; stabilizes the ryanodine receptor (RyR1) channel in skeletal muscle, reducing calcium leakage and improving excitation-contraction coupling.
250-500 mg orally 3-4 times daily, maximum 750 mg 4 times daily.
Dantrolene sodium: 2.5 mg/kg IV bolus, repeated as needed up to a cumulative dose of 10 mg/kg, then 1 mg/kg IV every 6 hours for 24-48 hours following malignant hyperthermia crisis.
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 is approximately 1.5-2 hours in healthy adults; prolonged in patients with hepatic impairment.
Primarily hepatic metabolism followed by renal excretion of metabolites; <1% excreted unchanged in urine; minor biliary/fecal elimination.
Primarily hepatic metabolism; <1% excreted unchanged in urine. Biliary/fecal excretion of metabolites accounts for the majority of elimination.
Category C
Category C
Skeletal Muscle Relaxant
Skeletal Muscle Relaxant
"The metabolism of Sulfisoxazole can be decreased when combined with Chlorzoxazone."