Pharmacology If a drug is active against the pre–erythrocytic stage of the malarial parasite it will be useful as a : A Suppressive prophylactic B Causal prophylactic C Clinical curative D Radical curative 💡 Explanation If a drug is active against the pre–erythrocytic stage of the malarial parasite it will be useful as a : ✓ Correct Answer: B. Causal prophylactic