Two cases of imported malaria which occurred in Okayama prefecture are reported. One was infected with Plasmodium vivax in India, the other with P. falciparum at Nigeria, Africa. The efficacy of some antimalarial drugs in these cases is discussed. One patient was infected with P. falciparum, despite taking the medicine Daraprim® regularly. The efficacy of Daraprim® for suppressive cure in Nigeria is doutful. The therapy of chloroquine-resistance tropical malaria is also discussed.