 
 <prompt> If drug manufacturer wan make billboard for new product, e go need to go meet FDA, but na only if the product dey wetin? <response>: The thalidomide wahala bring back Kefauver's bill wey dey enhance drug regulation wey bin dey hang for Congress, and the Kefauver-Harris Amendment become law on 10 October 1962. Manufacturers from now on go need prove to FDA say their drugs dey work well and dem dey safe before dem fit enter US market. FDA get power to control advert of prescription drugs and to set good manufacturing practices. The law talk say all drugs wey enter market between 1938 and 1962 must dey work well. An FDA - National Academy of Sciences study show say nearly 40 percent of these products no dey work. Another study for over-the-counter products start ten years later. 