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How does a prescription for Lipitor turn into one for Zyrtec? Or the diabetes drug Avandia get mistaken for the potentially deadly blood thinner Coumadin?

In my story later today on Marketplace about the art and danger of pharmaceutical branding, you'll hear from pharmacist and name safety expert Susan Proulx, who reveals a scary side effect of the pharmaceutical name game: thousands of drugs get mistaken for each other because their names either look or sound similar. Even more alarming, the incorrect drugs get into the hands of patients because of a doctor's really bad handwriting, as Marketplace Health Desk intern Michael Bernstein illustrates in this video story.

Follow Gregory Warner at @radiogrego