Drug Efficacy Study Implementation

Drug Efficacy Study Implementation (DESI) was a program begun by the Food and Drug Administration (FDA) in the 1960s after the requirement (in the Kefauver-Harris Drug Control Act) that all drugs be efficacious as well as safe, was made part of US law. The DESI program was intended to classify all pre-1962 drugs that were already on the market as either effective, ineffective, or needing further study.

Source: Wikipedia — Drug Efficacy Study Implementation (CC BY-SA 4.0)