Malaria is caused by plasmodium parasites transmitted via mosquito bites. The parasite has complex life cycles in both human and mosquito hosts. Anti-malarial drugs work by targeting different stages of the parasite's life cycle: blood schizonticides treat the blood stage in humans; causal prophylactics target liver stages; radical cure drugs act on liver parasites; and gametocytocides prevent transmission via mosquitoes. For uncomplicated malaria, first-line oral treatments are artemether-lumefantrine or quinine. For severe malaria, intravenous quinine is administered along with glucose to prevent hypoglycemia, a major problem in management.