Artemether/lumefantrine, sold under the trade name Coartem among others, is a combination of the two medications artemether and lumefantrine. It is used to treat malaria caused by Plasmodium falciparum that is not treatable with chloroquine. It is not typically used to prevent malaria. It is taken by mouth. Common side effects include muscle and joint pains, fever, loss of appetite, and headache. Serious side effects include prolonged QT syndrome. While not well studied it appears to be okay in pregnancy. The dose does not need changing in those with mild or moderate kidney or liver problems.