Significant increases in co-payments may reduce the use of medications and raise concern about adverse health consequences, according to a study published in the May 19 issue of the
Journal of the American Medical Association (JAMA).
In background information in the article the authors write, "In recent years, many health plans have implemented policies to contain drug costs, including raising beneficiary co-payments, mandating use of generics, requiring mail-order services, and expanding use of formularies, all of which have large effects on total drug spending. For example, doubling co-payments reduced total drug spending by 19 percent to 33 percent in one multiyear study of 25 companies."
Dana P. Goldman, Ph.D., from RAND, Santa Monica, Calif., and colleagues examined how changes in benefit design among privately insured populations affect use of the most commonly used drug classes. The researchers analyzed data from pharmacy and medical claims from 1997 to 2000 for 30 large U.S. employers and 52 health plans covering 528,969 beneficiaries, aged 18 to 64 years, continuously enrolled for up to four years.