Is it illegal to keep my prescribed expired controls? As long as they’re in a bottle and you can prove (via your ID) that the prescription is yours, then there’s no problem. You can also take them to an approved medicine disposal site to get rid of them if they’re expired.Click to see full answer. Also question is, is it illegal to take expired prescriptions?Indeed, the expiration date of such a pill may have long past, but it is still legal to carry that old prescription (as mentioned above, try to have the bottle ready, if not, attempt to obtain the old pharmacy records. Basically, there is no legal time limit on the possession of a prescription.Additionally, how long can you take medicine after the expiration date? Excluding certain prescription medicines such as nitroglycerin, insulin, and liquid antibiotics, most medicines stored under reasonable conditions retain at least 70% to 80% of their original potency for at least 1 to 2 years after the expiration date, even after the container has been opened. People also ask, what medications become toxic after expiration? Practically speaking, Hall said there is a handful of drugs known to degrade quite quickly, such as nitroglycerin tablets, insulin and tetracycline, an antibiotic that may become toxic to the kidneys after it expires.Do controlled substance prescriptions expire?Schedule III and IV controlled substances expire after 6 months. Schedule III and IV controlled substances cannot be filled or refilled more than 5 times or more than 6 months after the date the prescription was issued, whichever occurs first. Schedule II prescriptions cannot be refilled.