Because of the high cost of many prescription drugs, some people take fewer pills than prescribed. What are the health implications?
Imagine that four months ago, you started getting chest pains whenever you exerted yourself physically, and at the time you decided this was serious enough to see a doctor. After your doctor examined you and ran some tests, you were told that you have angina, a kind of heart disease. This disease can develop when the coronary arteries become narrow and clogged from high cholesterol and the heart can't get the oxygen that it needs. Your doctor helped you plan some lifestyle changes to treat your condition. You have been very devoted to the new way of life, eating healthier and doing the proper kinds of exercise regularly. Also, part of your treatment involves regularly taking the medication that your doctor prescribed for you. You were told to take one pill each day.
- I would take the pill every day as prescribed.
- I would skip some days to save some money.
How do your answers compare?
You have to save money somehow, right? Perhaps you would just have to cut back on other expenses in your life, but apparently you felt the medication had to be taken as prescribed. Research has found, however, that especially among the elderly, a significant portion of the population reports restricting medications due to cost. An important question is whether this leads to adverse health outcomes. Policy debates have been largely divided on this issue.
Do those who restrict their medications due to cost experience adverse health outcomes?
A research team led by Dr. Michele Heisler and Dr. Kenneth Langa conducted a study to investigate this question. Prior to this study, no one had examined this question by studying the same individuals at different points in time to see if those who restricted medication due to cost were more likely to develop adverse health outcomes. The researchers obtained nationally representative data that was the result of nearly 8000 interviews. Each respondent was interviewed in 1995 or 1996 and then re-interviewed in 1998. At both times, individuals were asked about cost-related medication restriction and about their health. The health questions assessed overall health, angina and other cardiovascular diseases, diabetes, arthritis, and depression.
The researchers found that cost-related medication restriction was associated with almost twice the odds of experiencing a significant decline in overall health. The association between restricting medication due to cost and poor health outcomes was strongest for those who had cardiovascular disease. Of these individuals, those who restricted their medication had a 50% increased odds of suffering angina and a 51% increased odds of having a stroke. Aren't you glad on the previous page you said you wouldn't restrict your angina medication?
Those who had arthritis or diabetes and restricted their medication due to cost did not report worse disease-related outcomes at the second interview. For arthritis, this might have been because of equally effective over-the-counter pain medications, and for diabetes, higher rates of kidney disease would likely require a longer period of follow-up to detect. When looking at age as a factor, the results showed that older adults experienced significant declines in overall health, worse cardiovascular outcomes, and increased depression. The study showed that younger people who restrict are also at risk for a decline in their health.
One limitation of this study is the lack of data about how often individuals restricted medications. If an individual restricted only once or twice, it is not clinically plausible that this would have led to an adverse health outcome. Also, the data on health outcomes were self-reported, and thus subject to bias. Previous studies, however, have shown excellent agreement between medical records and self-reports for conditions such as hypertension, diabetes, and stroke.
Implications on policy
This study provides evidence that, contrary to some claims, adults with chronic illnesses who restrict medications due to cost experience adverse health outcomes. As drug costs continue to escalate and individuals continue to lack full prescription coverage from their health insurance, it will be increasingly important for healthcare systems and physicians to develop strategies to screen patients for cost-related underuse of medications and to provide assistance to these patients. Moreover, insurance companies will need to create benefit packages that provide appropriate coverage, taking into account the cost of prescription medications.
For more information see:
Michele Heisler, Kenneth M. Langa, Elizabeth L. Eby, A. Mark Fendrick, Mohammed U. Kabeto, John D. Piette. The Health Effects of Restricting Prescription Medication Use Because of Cost. Medical Care, 42(7). 2004.