Primaquine-d3 (diphosphate) is the deuterium labeled Primaquine diphosphate. Primaquine Diphosphate (Primaquine phosphate), an 8-aminoquinoline, exerts a broad spectrum of activities against various stages of parasitic malaria. Primaquine Diphosphate remains as the only agent that destroys late hepatic stages and latent tissue forms of Plasmodium vivax and Plasmodium ovale[1][2].