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Patients can't recall their medications to tell doctors

CHICAGO --- Doctors rely on patients to accurately tell them what prescription medications and what dosages -- they are taking in out-patient visits. (A patient's chart may not always be available or complete.) That information is essential for physicians to monitor whether a drug is working, and whether it may have adverse interactions with any new medications prescribed.

Depending on patients recall of their drugs, however, may be dangerous to their health.

New research from Northwestern Universitys Feinberg School of Medicine has found that nearly 50 percent of patients taking antihypertensive drugs in three community health centers were unable to accurately name a single one of their medications listed in their medical chart. That number climbed to 65 percent for patients with low health literacy.

It was worse than we expected, said lead author Stephen Persell, M.D., an assistant professor of medicine, and of the Institute for Healthcare Studies at the Feinberg School, and a physician at Northwestern Memorial Hospital. It means doctors cant ask patients to tell them the medications they are taking for their chronic conditions like hypertension. Its very hard to get at the truth of what medications the patient is actually taking.

The study will be published in the November issue of the Journal of General Internal Medicine.

The Northwestern study looked at 119 patients, average age 55, from community health centers in Grand Rapids, Mich. Researchers asked them to name their antihypertensive drugs and then compared their answers to the drugs listed in their medical charts.

While the study focused on low-income patients, Persell said other patients likely have similar trouble recalling the names and dosages of all their medications, particularly those who take a lot of different drugs and the elderly, who may have cognitive limitations.

The gap between what medications a doctor thinks a patient is taking and what a patient actually takes is a new focus for improving the safety and quality of health care. One third of the nation's 1.5 million adverse drug events occur in out-patient settings, resulting in a cost of $1 billion annually. Persell thinks this "knowledge of medication gap" may be one of the causes.

The goal is "medication reconciliation," a term in the healthcare field that means patients and their healthcare providers understand and agree on the medications the patients are using and should be using.

Persell's study also showed patients with low health literacy were prescribed more antihypertensive medications than other patients and had higher blood pressure by about five points.

We think doctors may be prescribing more medications because the patients arent giving them the right information about what they are taking, he said.

Even examining patients medical records wont necessarily tell a doctor what pills a patient is swallowing. Persell said some patients continue to fill old prescriptions even if a doctor has changed the dosages or the medication.

Ive seen patients who continued on drugs that I told them to discontinue and stop taking drugs I never told them to stop using," Persell said.

The solution is to ask patients to bring all their current medicine bottles to doctor appointments, so the physician can compare them to what has actually been prescribed in the medical charts, Persell noted. That's how he learned a patient he had switched to a cheaper version of a drug continued to take the older expensive one along with the new one, so he was double dosing himself.

"This could have caused a dangerous drop in his heart rate and blood pressure," Persell said.

The Northwestern study indicates a need for future research to address how patients inability to name their medications -- particularly those with limited health literacy -- impacts hypertension control and drug safety, Persell said.


Contact: Marla Paul
Northwestern University

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