• Decrease font size
  • Return font size to normal
  • Increase font size
U.S. Department of Health and Human Services


  • Print
  • Share
  • E-mail

Why Are There So Many ADRs?

Schappert SM. Nat. Center Health Statistics. 1999, Series 13 No. 143
National Association of Chain Drug Stores. 2001
Jacubeit T et al. Agents Actions Suppl 1990;29:117–125



  • Two-thirds of patient visits result in a prescription
  • 2.8 BILLION outpatient prescriptions (10 per person in the United States) filled in 2000
  • ADRs increase exponentially with 4 or more medications


Back to Learning Module