The box of prescription drugs had been forgotten in a back closet of a retail pharmacy for so long that some of the pills predated the 1969 moon landing. Most were 30 to 40 years past their expiration dates — possibly toxic, probably worthless. But to Lee Cantrell, who helps run the California Poison Control System, the cache was an opportunity to answer an enduring question about the actual shelf life of drugs: Could these drugs from the bell-bottom era still be potent? Cantrell called Roy Gerona, a University of California, San Francisco researcher who specializes in analyzing chemicals. Gerona grew up in the Philippines and had seen people recover from sickness by taking expired drugs with no apparent ill effects. "This was very cool," Gerona says. "Who gets the chance of analyzing drugs that have been in storage for more than 30 years?"
The age of the drugs might have been bizarre, but the question the researchers wanted to answer wasn't. Pharmacies across the country in major medical centers and in neighborhood strip malls routinely toss out tons of scarce and potentially valuable prescription drugs when they hit their expiration dates. Gerona, a pharmacist; and Cantrell, a toxicologist, knew that the term "expiration date" was a misnomer. The dates on drug labels are simply the point up to which the Food and Drug Administration and pharmaceutical companies guarantee their effectiveness, typically at two or three years. But the dates don't necessarily mean they're ineffective immediately after they "expire" — just that there's no incentive for drugmakers to study whether they could still be usable.
What if the system is destroying drugs that are technically "expired" but could still be safely used?
In his lab, Gerona ran tests on the decades-old drugs, including some now defunct brands such as the diet pills Obocell (once pitched to doctors with a portly figurine called "Mr. Obocell") and Bamadex. Overall, the bottles contained 14 different compounds, including antihistamines, pain relievers and stimulants. All the drugs tested were in their original sealed containers.
The findings surprised both researchers: A dozen of the 14 compounds were still as potent as they were when they were manufactured, some at almost 100 percent of their labeled concentrations.
"Lo and behold," Cantrell says, "The active ingredients are pretty darn stable."
Cantrell and Gerona knew their findings had big implications. Perhaps no area of health care has provoked as much anger in recent years as prescription drugs. The news media are rife with stories of medications priced out of reach or of shortages of crucial drugs, sometimes because producing them is no longer profitable.
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.
Disclaimer: Please consult your physician before using any medication.
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