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<p><strong>You Are Here:</strong> <span class="crumb_link"><a href="/" class="crumb_link">AHRQ Archive Home</a> > <a href="/research/resarch.htm" class="crumb_link"><em>Research Activities</em> Archive</a> > <a href="." class="crumb_link">May 2004</a> </span></p>
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<td><h1><a name="h1" id="h1"></a> Feature Story </h1>
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<p>This information is for reference purposes only. It was current when produced and may now be outdated. Archive material is no longer maintained, and some links may not work. Persons with disabilities having difficulty accessing this information should contact us at: <a href="https://info.ahrq.gov/">https://info.ahrq.gov</a>. Let us know the nature of the problem, the Web address of what you want, and your contact information. </p>
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<h2><a name="head1">Significant increases in drug copayments may reduce patients' use of needed medications</a></h2>
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<p>Increasing patients' copayments for prescription medications led to decreases in their use of eight classes of therapeutic drugs, according to a new study cofunded by the Agency for Healthcare Research and Quality (HS13447).</p>
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<p>Researchers linked pharmacy claims data representing nearly 530,000 people aged 18 to 64. All of the subjects had employer-sponsored health insurance, with health benefit designs from 52 private health plans and 30 employers.
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The study included health insurance plans of all types that had one-tier, two-tier, three-tier, and coinsurance drug benefit plans. The simulated copayment increases were relevant for all plans but were calibrated to two-tier plans. The analysis followed study subjects for nearly 4 years. </p>
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<p>Based on this analysis, the researchers estimated that doubling copayments in a typical two-tier drug plan resulted in an approximately 45 percent reduction in the use of antiinflammatory drugs and antihistamines, a drop of approximately 35 percent in the use of cholesterol-lowering medications and drugs to treat ulcers and asthma, and a decrease of about 25 percent in the use of medicines for high blood pressure, depression, and diabetes. </p>
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<p>The rate of decrease depended on whether patients were taking the drug on an ongoing or intermittent basis. Patients with chronic illnesses were less likely to cut back or stop taking the medications needed to treat their conditions when drug copayments increased. However, they seemed to reduce their use of other medications. For example, the study found that patients with depression cut their use of most drugs by 25 percent but reduced their use of antidepressants by only 8 percent when their copayments doubled. Similarly, patients with high blood pressure cut their use of antihypertensives by only 10 percent but reduced their use of all other drugs by 27 percent.</p>
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<p>Researchers also found preliminary evidence that patient health suffers as individuals with some chronic illnesses cut back on their medicines. For example, as the use of prescription drugs declined, visits to hospital emergency rooms increased 17 percent, and hospital stays rose by 10 percent among patients with diabetes, asthma, and gastric acid diseases.</p>
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<p>The research team was led by Dana P. Goldman, Ph.D., and Geoffrey F. Joyce, Ph.D., and their colleagues at the RAND Corporation in Santa Monica, CA, as well as by coauthors from Merck and California Healthcare Foundation. Both organizations also co-funded the study. </p>
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<p>For more information, see "Pharmacy benefits and the use of drugs by the chronically ill," by Drs. Goldman and Joyce, Joe J. Escarce, M.D., Ph.D., and others, in the May 19, 2004, <em>Journal of the American Medical Association</em> 291(19), pp. 2344-2350.</p>
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