Comparative Pharmacology
Head-to-head clinical analysis: PACERONE versus QUINORA.
Peer-Reviewed Evidence
Head-to-head clinical analysis: PACERONE versus QUINORA.
PACERONE vs QUINORA
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Class III antiarrhythmic agent; prolongs action potential duration and refractory period by blocking potassium channels, and also exhibits class I, II, and IV effects.
Quinora (quinidine) is a Class Ia antiarrhythmic agent that blocks sodium channels, prolonging the action potential duration and effective refractory period. It also exhibits anticholinergic and negative inotropic effects.
Loading dose: 800-1600 mg/day PO in divided doses for 1-3 weeks, then 600-800 mg/day PO for 1 month; maintenance: 200-400 mg/day PO once daily. IV: 150 mg over 10 min, then 1 mg/min for 6 hours, then 0.5 mg/min.
325 mg orally every 4 to 6 hours as needed, not to exceed 4 g/day.
None Documented
None Documented
Biphasic: initial 3-10 days; terminal elimination half-life 40-58 days (mean ~53 days) due to extensive tissue distribution and slow release from fat. Clinical context: steady-state achieved in 2-4 months without loading dose.
5-7 hours; prolonged in hepatic impairment (up to 12-15 hours) and in elderly patients.
Primarily hepatic metabolism (CYP3A4, CYP2C8) to desethylamiodarone (active). Renal elimination of drug and metabolites: <1% of unchanged drug; ~40% of dose as metabolites. Fecal elimination: ~70% of dose as metabolites, with some parent drug.
Primarily hepatic (biliary) excretion into feces (~80-90%); renal excretion of unchanged drug accounts for ~10-20%.
Category C
Category C
Antiarrhythmic Agent
Antiarrhythmic Agent