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Following Directions on Prescription Drug Labels

Unfortunately, they're not that easy to understand

En español | If one drug’s label says “take twice a day,” and a second one says “take every 12 hours,” does that mean the same thing? And could you take both medications together?

Unsure? You’re not alone.

Sign up for the AARP Health Newsletter.

Prescription bottle - prescription drug directions are often confusing to seniors

Confused about the instructions on your medication bottle? Ask your doctor. — Photo by Brian Hagiwara/Getty Images

An estimated 90 million adults in the United States misunderstand drug labels or have trouble following their directions, according to the Institute of Medicine.

Even more troubling is the predicament of many older adults who take several prescription drugs. For them, it’s even more difficult to create a simple schedule for medications with different label instructions.

A recent Northwestern University study of 464 adults ages 55 to 74 found that even when the directions for two drugs were basically identical — “twice daily” and “every 12 hours” — only about one in five realized they could take the drugs at the same time.

The research findings, published last year in the Archives of Internal Medicine, provide the latest reminder that confusing and vague medication directions can undermine treatment.

Compounding the problem is that an estimated 80 million Americans are particularly vulnerable, struggling to understand medical details and related complexities with limited health literacy skills. Among older adults specifically, low health literacy can boost the risk of poor health and even death compared with those having average skills, according to a review of nearly 100 health literacy studies published in the Annals of Internal Medicine.

But highly educated individuals also can be tripped up by poorly written directions, says study coauthor Terry Davis, professor of medicine at Louisiana State University Health Sciences Center at Shreveport. Take dosing recommendations as one example, she says.

“If it’s three times a day, that doesn’t tell you when to take it,” Davis says. “Is a day considered 24 hours or 12 hours? Do you wake up in the middle of the night to take it? Does the doctor expect that?”

Last year, the U.S. Pharmacopeial Convention, which sets drug standards, proposed new labeling standards designed to clear up the confusion. Among the USP recommendations: Use larger print to ease reading, replace medical terminology like “hypertension” with plain language like “high blood pressure,” and specify more precisely when to take a drug.

Next: Ask your doctor about these drug label directions. »

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