If I am not at ongoing risk for getting HIV, can I take PrEP only when I’m at risk?

Although the updated PrEP guideline provides information on how to correctly use the “2-1-1” schedule, this approach is not approved by the U.S. Food and Drug Administration (FDA) and is not recommended by CDC. Taking PrEP as prescribed is currently the only FDA-approved schedule for taking PrEP to prevent HIV. When taken as prescribed, PrEP is highly effective for preventing HIV.