Primaquine Bookmark Share View Topic Outline Oral PrimaquinePrimacin Mechanism of Action Unknown.MicrobiologyEffective against Plasmodium vivax and ovale as they enter a dormant phase in the liver.Clinical UseIndicationsContraindicationsAdverse Effects Want more info like this? MedSchool Your electronic clinical medicine handbook Guides to help pass your exams Tools every medical student needs Quick diagrams to have the answers, fast Quizzes to test your knowledge Sign Up Now