Even if it didn't cost a dime, some drug companies might not be interested in longer expiration dates. If the expiration date is passed, and you throw it out, y

Even if it didn't cost a dime, some drug companies might not be interested in longer expiration dates. If the expiration date is passed, and you throw it out, you'll have to buy a new supply. More profit! It's a perverse effect, but that's the way it is.