Drug Groups

approved

Description

A 4-aminoquinoquinoline compound with anti-inflammatory properties. [PubChem]

Indication

For treatment of acute malarial attacks in non-immune subjects.

Pharmacology

Amodiaquine, a 4-aminoquinoline similar to chloroquine in structure and activity, has been used as both an antimalarial and an anti-inflammatory agent for more than 40 years. Amodiaquine is at least as effective as chloroquine, and is effective against some chloroquine-resistant strains, although resistance to amodiaquine has been reported. The mode of action of amodiaquine has not yet been determined. 4-Aminoquinolines depress cardiac muscle, impair cardiac conductivity, and produce vasodilatation with resultant hypotension. They depress respiration and cause diplopia, dizziness and nausea.

Toxicity

LD₅₀ (mouse, intraperitoneal) 225 mg/kg, LD₅₀ (mouse, oral) 550 mg/kg. Symptoms of overdose include headache, drowsiness, visual disturbances, vomiting, hypokalaemia, cardiovascular collapse and cardiac and respiratory arrest. Hypotension, if not treated, may progress rapidly to shock. Electrocardiograms (ECG) may reveal atrial standstill, nodal rhythm, prolonged intraventricular conduction time, broadening of the QRS complex, and progressive bradycardia leading to ventricular fibrillation and/or arrest.

Affected Organisms

Biotransformation

Hepatic biotransformation to desethylamodiaquine (the principal biologically active metabolite) is the predominant route of amodiaquine clearance with such a considerable first pass effect that very little orally administered amodiaquine escapes untransformed into the systemic circulation.

Absorption

Rapidly absorbed following oral administration.

Half Life

5.2 ± 1.7 (range 0.4 to 5.5) minutes

References

External Links