Displaying 3 results of Fosamprenavir Stable Isotopes Fosamprenavir is a protease inhibitor that is used in the treatment of HIV-1 infection. Stable isotopes of Fosamprenavir are non-radioactive isotopes that have the same number of protons and electrons as the standard isotope but differ in their number of neutrons. These isotopes are useful for research purposes as they allow for the tracking of the drug in biological systems without the risk of radiation exposure.