Expiration Date The expiration date identifies the time during which the prescription drug may be expected to meet the requirements of the Pharmacopeial monograph, provided it is kept under the prescribed storage conditions. Most medications are potent and safe after the expiration date. The exceptions are insulin, liquid antibiotics and nitro-glycerine. According to the FDA drugs expire on the date they re projected to have lost 10 percent of their potency, which means they are still 90% effective,... Mehr