Drug expiration dating mixture
But imagine an Epi Pen, which keeps people from going into anaphylactic shock, not working." "Let's say it takes a year for a drug's potency to decrease to 95%," says Paul Langevin, MD, director of cardiac anesthesiology at Waterbury Hospital in Waterbury, Connecticut."I can't tell you six months later if it's at 93% potency or at 33%.
Gel capsules, liquids and suspensions (in which the active ingredient is "suspended" in liquid) lose potency more quickly than pills and capsules—and, worse, they're at risk of becoming contaminated by bacteria. Expiration dates are based on the assumption that an unopened package is stored in a cool, dry, dark place."They may not completely kill the bacteria and lead to a resistant infection." Even worse, tetracycline—a common antibiotic—is one of the few medications ever shown to be toxic (not just less potent) after its expiration date.Pharmacies take pills out of their original containers, repackage them and put new expiration dates on.The beyond use date is not later than the expiration date on the manufacturer's container or one year from the date the drug is dispensed, whichever is earlier.The effectiveness of a medicine may decrease over time, but studies have shown for most medications that much of the original potency still remains years after the expiration date.