USP DI Advice for the Patient A guide to more than 9,000 prescription and over-the-counter medications from the USP DIĘ Advice for the PatientĘ, published by the United States Pharmacopeia (USP). Provided through the National Library of Medicine's consumer health web site, MEDLINEplus. Special instructions: Browse by first letter of generic or brand name drug Selected by: janetnel@usc.edu