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ON THE COVER:

German stopwatch beside a variety of pills, illustrating the relevance of time to medications' effectiveness. Some modern pharmaceuticals release their contents gradually, while others must be taken on a strict schedule to be effective.

Image by Dennis D. Potokar / Science Source. Science Source is a registered trademark of Photo Researchers, Inc. Image and text copyright 2013 Photo Researchers, Inc. All Rights Reserved.

See related article:

“Patient Characteristics Associated with Medication Adherence” pp. 54–65.