Diana Levine suffered from chronic migraine headaches for many years. So, in April 2000, when she went to a local clinic to get treatment, she knew what to expect. She’d received the same treatment several times before: an injection of Demerol for the pain, and an injection of an antihistamine called Phenergan to treat the nausea that accompanies both migraine headaches and Demerol itself. Everything was normal — except for how the drugs were actually administered. The physician’s assistant who gave…

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