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Dear Doctor Letter (Rote-Hand-Brief) on Fentanyl®-Janssen and Durogesic® SMAT (12, 25, 50, 75, 100 µg/h), transdermal patch (active substance: fentanyl): New warning

Active substance: fentanyl

New warning regarding medicinal products (and generics) containing fentanyl and the possible occurrence of serotonin syndrome if used concomitantly with serotonergic medicines.