Subjects must be receiving ATV 300 mg/ritonavir (RTV) 100 mg plus 2 NRTIs OR DRV 800 mg/RTV 100 mg plus 2 NRTIs for at least 6 months prior to screening
Plasma HIV-1 RNA concentrations at undetectable levels in the 6 months preceding the screening visit and have HIV-1 RNA \< 50 copies/mL at screening
Subjects experiencing intolerance to RTV (as determined by the investigator)
Both groups
The ability to understand and sign a written informed consent form
Normal ECG
Mild to moderate renal function
Stable renal function
Hepatic transaminases (AST and ALT) ≤ 5 x the upper limit of the normal range (ULN)
Total bilirubin ≤ 1.5 mg/dL, or normal direct bilirubin (subjects with documented Gilbert's Syndrome or hyperbilirubinemia due to atazanavir therapy may have total bilirubin up to 5 x ULN)
Adequate hematologic function
Serum amylase ≤ 5 x ULN
Males and females of childbearing potential must agree to utilize highly effective contraception methods from screening throughout the duration of study treatment and for 30 days following the last dose of study drug
Age ≥ 18 years
You may not be if
New AIDS-defining condition diagnosed within the 30 days prior to screening
Receiving drug treatment for hepatitis C, or anticipated to receive treatment for hepatitis C
Subjects experiencing decompensated cirrhosis
Females who are breastfeeding
Positive serum pregnancy test (female of childbearing potential)
Implanted defibrillator or pacemaker
Current alcohol or substance use judged by the investigator to potentially interfere with subject study compliance
History of malignancy within the past 5 years or ongoing malignancy other than cutaneous Kaposi's sarcoma, basal cell carcinoma, or resected, noninvasive cutaneous squamous carcinoma
Active, serious infections (other than HIV-1 infection) requiring parenteral antibiotic or antifungal therapy within 30 days prior to baseline
Receiving ongoing therapy with any of medications contraindicated for use with elvitegravir (EVG), COBI, FTC, TDF, ATV, DRV; or subjects with any known allergies to the excipients of E/C/F/TDF STR, COBI tablets, ATV capsules or DRV tablets or contraindicated for the 2 NRTIs as part of the PI/co regimen
Participation in any other clinical trial without prior approval
Any other clinical condition or prior therapy that would make the subject unsuitable for the study or unable to comply with the dosing requirements
