If you take the protease inhibitor (PI) team of Lexiva (fosamprenavir) boosted by Norvir (ritonavir), and you’ve never used other PIs, a new dose is possible. People who take Lexiva/Norvir once a day can reduce the Norvir booster dose from 200mg to 100mg. It works just as well, studies say, and might cause fewer side effects. For those who’ve used PIs before or who take their HIV meds twice a day, the Norvir dose stays right where it is—200mg a day.