Medication Adherence in a Nationwide Cohort of Veterans Initiating Pre-exposure Prophylaxis (PrEP) to Prevent HIV Infection.

Background: Current guidelines for pre-exposure prophylaxis (PrEP) to prevent HIV infection call for long-term, daily use of tenofovir disoproxil fumarate/emtricitabine (TDF/FTC). Little is known about long-term adherence with TDF/FTC prescribed for PrEP in routine clinical practice.

Setting: Veterans Health Administration (VHA) clinics.