A lot of people's medicine cabinets have at least a few expired bottles of something. Old antibiotics, pain meds -- bottles so old they probably can't even remember what ailment brought them to the doctor to get them in the first place.

But tomorrow, April 28, is National Prescription Drug Take Back Day. It's when police and sheriff's departments throughout the country accept unwanted, unused or expired medications.

Designed to prevent drug addiction and overdose deaths, it's run by the Drug Enforcement Agency, which says 64 million Americans abuse controlled prescription drugs like fentanyl, vicodin and oxycontin. Many of those drugs are obtained from the medicine cabinets of family and friends.

During the last Take Back Day, the DEA collected 456 tons of prescription drugs.

For more information on where to drop off old, unused meds, there's a collection site locator online:  TakeBackDay.dea.gov.

But if you aren't able to get to one of the take-back sites during Take Back Day, it's best not to put unused prescription drugs in the trash or flush them down the toilet. They could end up in the water supply.

Many pharmacies, including CVS and Walgreens and Kaiser, have take-back boxes available year round.