En español | Nearly 90 percent of people over 60 take at least one prescription drug; 30 percent take five or more. When multiple doctors and pharmacies issue the prescriptions — a situation known as "polypharmacy" — overmedication and dangerous reactions can occur, especially in the elderly. Over-the-counter drugs can put patients at further risk.

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— Photo by Joel Sartore

A guideline known as the "Beers Criteria" details potentially inappropriate medications for older Americans. Although the list has recently been updated by American Geriatrics Society experts using new methodology, it is still merely a guideline — patients, doctors and pharmacists must work together to find the best and safest drug treatments.

This week, Inside E Street explores the threat of prescription drug overuse in the elderly and how you can safeguard yourself and your family.