Primaquine (or primaquine phosphate)'s a medication used in the treatment of malaria and Pneumocystis pneumonia. It's a member of the 8-aminoquinoline group of drugs that includes tafenoquine and pamaquine. Indications Radical cure Primaquine's mainly used to treat the P. vivax or P. ovale malaria. Once the parasite has been eliminated from the bloodstream, the remaining hypnozoites must be removed from the liver and this's done by administering a 14 day course of primaquine (called radical cur… (More on Primaquine)