Bictegravir in the Elderly Living With HIV (BICEP)

This is a prospective, open-label, single center, post-approval and post-marketing study. Current national guideline recommends an integrase strand inhibitors (INSTI) in combination with two nucleoside reverse transcriptase inhibitors (NRTIs) as standard of therapy for HIV-1 infected patients. INSTI-based regimen may require a potent CYP3A inhibitor such as cobicistat to increase INSTI\'s plasma concentration and prolongs half-life. However, co-administration with a CYP3A inhibitor may increase the risk of drug-drug interactions. A novel INSTI, bictegravir, does not need a booster for pharmacokinetic enhancement. Hypothesis: switching HIV-1 infected patients from booster containing regimen to bictegravir based regimen would decrease the risk of drug-drug interactions caused by a booster and improve quality of life and adherence.