Comparative Pharmacology
Head-to-head clinical analysis: CHLOROQUINE PHOSPHATE versus HYDROXYCHLOROQUINE SULFATE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CHLOROQUINE PHOSPHATE versus HYDROXYCHLOROQUINE SULFATE.
CHLOROQUINE PHOSPHATE vs HYDROXYCHLOROQUINE SULFATE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Chloroquine is a 4-aminoquinoline that acts as a blood schizonticide. It inhibits heme polymerase in malaria parasites, preventing the conversion of toxic heme to hemozoin, leading to accumulation of toxic heme and parasite death. It also has anti-inflammatory and immunomodulatory effects via inhibition of toll-like receptors and cytokine production.
Antimalarial and immunosuppressive agent. Accumulates in lysosomes, raising pH, impairing antigen processing and presentation. Inhibits toll-like receptor signaling and cytokine production (e.g., IL-6, TNF-α). Interferes with quinone reductase activity and heme polymerization in plasmodia.
600 mg base (1 g phosphate) orally once daily for 2 days, then 300 mg base (500 mg phosphate) orally once daily for 3 days for malaria. For extraintestinal amebiasis: 600 mg base (1 g phosphate) orally once daily for 2 days, then 300 mg base (500 mg phosphate) orally once daily for 2-3 weeks.
200-400 mg orally once daily or divided twice daily; maximum 600 mg/day or 6.5 mg/kg/day (whichever is lower). For malaria: 800 mg loading dose, then 400 mg at 6, 24, and 48 hours.
None Documented
None Documented
Terminal elimination half-life: 30-60 days (range 20-100 days); prolonged due to extensive tissue distribution and slow release from lysosomes.
Terminal half-life: ~40–50 days (range 30–60 days) due to extensive tissue distribution. Steady-state reached after 4–6 months.
Renal: 50-70% as unchanged drug; hepatic/biliary: 20-30% as metabolites; fecal: up to 20%.
Renal: ~50% unchanged; Hepatic metabolism: ~50% (desethylchloroquine, desethylhydroxychloroquine); Fecal: minimal (<5%).
Category C
Category A/B
Antimalarial
Antimalarial / DMARD