Comparative Pharmacology
Head-to-head clinical analysis: PROCAINAMIDE HCL versus QUINACT.
Peer-Reviewed Evidence
Head-to-head clinical analysis: PROCAINAMIDE HCL versus QUINACT.
PROCAINAMIDE HCL vs QUINACT
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Class Ia antiarrhythmic agent; blocks sodium channels, decreases phase 0 slope of action potential, prolongs refractory period, and increases action potential duration.
Quinacrine is a 9-aminoacridine derivative that intercalates into DNA, inhibiting DNA replication and transcription, and also has antimalarial, anti-inflammatory, and antihelminthic properties. It inhibits phospholipase A2 and suppresses immune responses.
For life-threatening ventricular arrhythmias, IV: Loading dose: 100 mg administered at a rate of 25-50 mg/min, may repeat every 5 minutes until arrhythmia suppressed or up to a total of 500-1000 mg. Maintenance: IV infusion 1-4 mg/min. Oral: 250-500 mg every 3-6 hours; maximum 4 g/day.
100 mg orally three times daily.
None Documented
None Documented
Terminal elimination half-life: 2.5-4.7 hours (3 hours typical) in normal renal function; prolonged to 11-20 hours in renal impairment; NAPA half-life 6-8 hours (prolonged in renal failure).
Terminal elimination half-life: 12-15 hours (prolonged in renal impairment; CrCl <30 mL/min: 24-40 hours)
Primarily renal (50-60% unchanged via glomerular filtration and tubular secretion) with 10-30% as N-acetylprocainamide (NAPA) metabolite; minor biliary/fecal (<5%).
Renal: 70% unchanged; biliary/fecal: 20% as metabolites; 10% other
Category A/B
Category C
Antiarrhythmic (Class Ia)
Antiarrhythmic (Class Ia)