Pharmacology Dose of chloroquine for prophylaxis against vivax malaria: September 2012 A 150 mg (base) weekly B 300 mg (base) weekly C 600 mg (base) weekly D 900 mg (base) weekly 💡 Explanation Dose of chloroquine for prophylaxis against vivax malaria: September 2012 ✓ Correct Answer: B. 300 mg (base) weekly