A combination drug or a fixed-dose combination (FDC) is a medicine that includes two or more active ingredients combined in a single dosage form. Initially, fixed-dose combination drug products were developed to target a single disease (such as with antiretroviral FDCs used against AIDS). However, FDCs may also target multiple diseases. Some of the popular combination drugs available in the global market are Atripla, Kaletra, Combivir, Trizivir, Truvada, Excalia, Contrave, Symbax.