 So find those old drugs, including pet meds, and get rid of them. The best way to do this is via a drug take-back program. Many local pharmacies, grocery stores, and hospitals have drop-off boxes. It's a free service, and you don't need to show any identification or fill out any paperwork. You should leave the drugs in their containers, but remove any prescription labels or use a marker to block out your personal information to protect your privacy. Now, if for some reason you can't take it back, it's better to toss unused prescriptions in the trash than to hold on to them.