What is Kaletra?

Kaletra is a combination of two antiretroviral medications: lopinavir and ritonavir. In this combination, lopinavir, a protease inhibitor, is the active ingredient, and ritonavir causes the lopinavir level in the blood to increase by 20 times over lopinavir alone. Kaletra is used in the treatment of the human immunodeficiency virus (HIV) infection. It works by interfering with the protease enzyme to limit reproduction of the HIV virus and by slowing the destruction of the immune system. Kaletra does not cure or prevent HIV infection; it slows the progress of the disease in combination with other HIV medications.

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