[Pengobatan malaria semakin lama mengalami resistensi di berbagai daerah. Akar pasak bumi (Eurycoma longifolia) adalah tanaman yang berpotensi sebagai terapi malaria karena memiliki kandungan kuasinoid. Penelitian ini melakukan uji ekstrak akar pasak bumi (E. longifolia) dosis 60 mg/kgBB dan 75 mg/kgBB secara tunggal dan kombinasi masing-masing dengan klorokuin via oral. Jenis penelitian eksperimental in vivo dengan subjek penelitian mencit Swiss yang terinfeksi Plasmodium berghei. Hasil penelitian perbandingan hari ke-4 dan hari ke-0 tingkat parasitemia memiliki nilai signifikan (p<0,05) pada uji One way Anova. Persentase inhibisi pertumbuhan pada kelompok kombinasi mencapai 98,5% dan 98,9% dibandingkan klorokuin sebagai obat standar mencapai 100%. Sedangkan pasak bumi tunggal inhibisi <50%. Dapat disimpulkan pemberian kombinasi lebih baik menurunkan dan menekan parasitemia dibandingkan pemberian ekstrak akar pasak bumi secara tunggal berdasarkan hasil analisis data perbedaan bermakna (p<0,05).;Malaria treatment is going to become resistance in various regions. Eurycoma longifolia jack is a plant that has potential as malaria therapy due to contain quassinoid as antimalarial. This study was to test Eurycoma longifolia jack extract dose 60 mg/kgBB and 75 mg/kgBB in single and combination with chloroquine via oral. Type of studies is experimental in vivo with Swiss mice infected by Plasmodium berghei as subject. Results of comparative study day 4 and day 0 levels of parasitemia has significant value (p<0,05). The percentage of growth inhibition in the combination group reached 98,5% and 98,9% compare with reference standard therapy chloroquine that reached 100%, while the single of Eurycoma longifolia jack <50%. It can be concluded combination group better than single group of Eurycoma longifolia jack to reduce and supress parasitemia based on the post-hoc analysis there were significant differences (p<0,05)., Malaria treatment is going to become resistance in various regions. Eurycoma longifolia jack is a plant that has potential as malaria therapy due to contain quassinoid as antimalarial. This study was to test Eurycoma longifolia jack extract dose 60 mg/kgBB and 75 mg/kgBB in single and combination with chloroquine via oral. Type of studies is experimental in vivo with Swiss mice infected by Plasmodium berghei as subject. Results of comparative study day 4 and day 0 levels of parasitemia has significant value (p<0,05). The percentage of growth inhibition in the combination group reached 98,5% and 98,9% compare with reference standard therapy chloroquine that reached 100%, while the single of Eurycoma longifolia jack <50%. It can be concluded combination group better than single group of Eurycoma longifolia jack to reduce and supress parasitemia based on the post-hoc analysis there were significant differences (p<0,05).]