This app is a comprehensive, step-by-step guide to screening patients for appropriateness of using PrEP, choosing and prescribing a regimen, the initial and follow-up evaluations, and counseling patients on side effects, risk reduction, and effectiveness. The app also includes built-in calculators for estimated glomerular filtration rate and estimated creatinine clearance, which are important for determining which regimen is appropriate for your patient, as well as references and guidelines.