Did you ever wonder how terrible it would be if you ate that expired medicine in your medicine cabinet? In brief: probably not so bad. Here’s an article from the Mayo Clinic about the US military Shelf Life Extension Program (SLEP). Most drugs maintain all their potency 2-8 years after their expiration date. The only ones on their list that needed to be thrown out on the expiration date was Albuterol and Diphenhydramine (Benadryl). If you store your medicines in less than ideal conditions, your mileage may vary. Read it for yourself. Read the tables.