The injections work best for younger patients with fairly recent pain rather than chronic, debilitating pain that has lasted for several years, said Dr. Steven Cohen, an associate professor of anesthesiology at Johns Hopkins medical school.
Institute for Safe Medication Practices: http://www.ismp.org
AP writers Michael Rubinkam in Pennsylvania and Bruce Schreiner in Louisville, Ky., contributed to this story.
AP Medical Writer Lindsey Tanner can be reached at http://www.twitter.com/LindseyTanner
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