Lexiva is an HIV medication. It is in a category of HIV medicines called protease inhibitors (PIs). Lexiva prevents cells infected by HIV from producing new virus. This reduces the amount of virus in your body.
In some parts of the world, fosamprenavir is sold under the brand name Telzir.
Lexiva must be used in combination with other HIV drugs. Along with other medications, Lexiva is often combined with low doses of Norvir (ritonavir), another protease inhibitor used to boost the amount of Lexiva in the bloodstream (which makes Lexiva more effective against HIV, including drug-resistant HIV, and easier to take).
Based on what we know about the drug interactions with Lexiva, it is likely that other HIV drugs can interact with Lexiva. HIV protease inhibitors can interact with Lexiva. Norvir (ritonavir), Kaletra (lopinavir/ritonavir), Reyataz (atazanavir), Crixivan (indinavir), and Viracept (nelfinavir) may all increase Lexiva levels in the bloodstream. An increased rate of side effects have been seen when people combine Lexiva with Kaletra, and the two should not be used together. Invirase (saquinavir) may decrease the amount of Lexiva in the bloodstream, and studies have not established a safe way to combine Invirase and Lexiva.
HIV non-nucleoside reverse transcriptase inhibitors (NNRTIs) can also interact with Lexiva. Sustiva (efavirenz) and Viramune (nevirapine) may decrease the amount of Lexiva in the bloodstream. Rescriptor (delavirdine), can increase levels of Lexiva in the bloodstream. No dosing recommendations have been made, although low-dose Norvir may be necessary if Viramune is combined with Lexiva. An additional 100mg (total 300mg) of Norvir may be needed if Lexiva is used once-daily with Sustiva. No additional Norvir is recommended if Lexiva is dosed twice-daily. Using Lexiva with either Rescriptor or Intelence is not recommended.
Short-term side effects include rash, appetite loss, headaches, feeling crummy (malaise), diarrhea, nausea, and vomiting. While these are the same side effects caused by Agenerase, many are less common with Lexiva. Very often, these side effects improve within a few months/weeks of starting Lexiva.
Severe, life-threatening rashes have been documented with Lexiva. People with a moderate rash and other allergic symptoms, and people with severe rashes should stop taking Lexiva.
HIV drug regimens containing protease inhibitors, including Lexiva, can cause increased fat levels (cholesterol and triglycerides) in the blood, abnormal body-shape changes (lipodystrophy; including increased fat around the abdomen, breasts, and back of the neck, as well as decreased fat in the face, arms, and legs), and diabetes.