Primaquine Failure and Cytochrome P-450 2D6 in Plasmodium vivax Malaria

Abstract
Primaquine is the only medication approved by the Food and Drug Administration to eradicate the hypnozoites of Plasmodium vivax, but relapses of P. vivax malaria due to drug failure occur.1 Human cytochrome P-450 isoenzyme 2D6 (CYP2D6) may be a key enzyme involved in metabolizing primaquine into redox-active metabolites against hypnozoites in the liver.2,3