The FDA warned that Alkermes' Vivitrol may have adverse effects, saying it received 196 reports of patients who experienced pain, swelling, bleeding and other problems after taking the alcohol-dependence drug. Vivitrol is an extended-release formulation of naltrexone, a generic treatment marketed by Cephalon. Alkermes did not comment, but a Cephalon spokeswoman said the complications seemed to stem from improper injection of the drug into muscle.

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