Lopinavir/Ritonavir

**Semantic type:** Pharmacologic Substance

**Definition:** A fixed combination of two protease inhibitors, lopinavir and ritonavir, used to treat human immunodeficiency virus (HIV) infection. The ritonavir in the combination drug increases the concentration and biological half-life of lopinavir but is not present in sufficient concentration to act as a protease inhibitor.

**Synonyms:** - Kaletra - Kaletra - lopinavir/ritonavir