The American College of Emergency Physicians say 365 days of showers and baths worth of humidity can cause some drugs to lose their Potency.
And when this happens a patient may not be getting the right dosage of medicine.
Researchers say keeping old prescriptions too long can increase the risk of taking the wrong pill.
Doctors also suggest keeping prescriptions in linen closets or a dark area away from kids, instead of medicine cabinets.
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