Efavirenz: when used in combination with efavirenz and two nucleoside reverse transcriptase inhibitors in multiple protease inhibitor-experienced patients, increasing the dose of Kaletra 33.3% from 400/ 100 mg (3 capsules) twice daily to 533/ 133 mg (4 capsules) twice daily yielded similar lopinavir plasma concentrations as compared to historical data of Kaletra 400/ 100 mg (3 capsules) twice daily.