A Study in Healthy Participants to Assess the Effect of Darunavir, Emtricitabine, and Tenofovir Alafenamide in the Presence of Cobicistat as Fixed Dose Combination (Darunavir/Cobicistat/Emtricitabine/Tenofovir Alafenamide) Compared With Co-administration of the Separate Agents

Inclusion criteria

• Must have a body mass index (BMI = weight/height^2) between 18.5 and 30.0 kilogram per meter square (kg/m^2) (extremes included), and body weight not less than 50 kilogram (kg)
• Must be healthy on the basis of physical examination, medical history, vital signs, and electrocardiogram (ECG) performed at screening (results must be available on Day -1). If there are abnormalities, the participant may be included only if the investigator judges the abnormalities or deviations from normal to be not clinically significant. This determination must be recorded in the participant's source documents and initialed by the investigator
• Participant must be healthy on the basis of clinical laboratory test performed at screening (results must be available on Day -1). If the results of the serum chemistry panel, hematology, or urinalysis are outside the normal reference ranges, the participant may be included only if the investigator judges the abnormalities or deviations from normal to be not clinically significant. This determination must be recorded in the participant's source documents and initialed by the investigator
• A woman (of childbearing potential) must have a negative highly sensitive serum beta-human chorionic gonadotropin (beta-hCG) pregnancy test, 4 days or less before dosing of the first treatment period
• A woman must agree not to donate eggs (ova, oocytes) for the purposes of assisted reproduction during the study and for at least 90 days after receiving the last dose of study drug

Exclusion criteria

• Has history or current clinically significant medical illness including (but not limited to) cardiac arrhythmias or other cardiac disease, hematologic disease, coagulation disorders (including any abnormal bleeding or blood dyscrasias), lipid abnormalities, significant pulmonary disease (including bronchospastic respiratory disease), diabetes mellitus, hepatic or renal insufficiency (for example, estimated creatinine clearance below less than [<] 90 milliliter per minute [mL/min] at screening), gastrointestinal disease (such as significant diarrhea, gastric stasis, or constipation that in the investigator's opinion could influence drug absorption or bioavailability), thyroid disease, neurologic or psychiatric disease, infection, or any other illness that the investigator considers should exclude the participant or that could interfere with the interpretation of the study results
• Had one or more of the laboratory abnormalities at screening as outlined in the protocol by the Division of Acquired immunodeficiency syndrome (DAIDS) Table for Grading the Severity of Adult and Pediatric Adverse Events and in accordance with the normal ranges of the clinical laboratory
• Clinically significant abnormalities during physical examination, vital signs, or 12 lead ECG at screening or at admission to the study center as deemed appropriate by the investigator
• Has a history of drug or alcohol abuse according to Diagnostic and Statistical Manual of Mental Disorders (5th edition) (DSM-V) criteria within 1 year before screening or positive test result(s) for alcohol and/or drugs of abuse (such as hallucinogens, barbiturates, opiates, opioids, cocaine, cannabinoids, amphetamines, methadone, benzodiazepines, methamphetamine, tetrahydrocannabinol, phencyclidine, and tricyclic antidepressants) either at screening or on Day 1 of each treatment period
• Has known allergies, hypersensitivity, or intolerance to Darunavir (DRV),Cobicistat (COBI), Emtricitabine (FTC), and/or Tenofovir Alafenamide (TAF), or any of their excipients
• Is a woman who is pregnant, or breast-feeding, or planning to become pregnant during this study or within 90 days after the last intake of study drug, or a woman of childbearing potential who is unwilling to use acceptable methods of contraception
• Has a history of hepatitis A antibody immunoglobulin M (IgM), hepatitis B surface antigen (HBsAg) or hepatitis C antibody (anti-HCV) positive, or other clinically active liver disease, or tests positive for hepatitis A antibody IgM, HBsAg or anti-HCV at screening
• Has a history of human immunodeficiency virus type 1 or type 2 (HIV-1 or HIV-2) infection, or tests positive for HIV-1 or HIV-2 at screening
• Has had any contact with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) positive or coronavirus disease-19 (COVID-19) patients within the last 2 weeks prior to admission to the clinical research center