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If your request is related to a product complaint or adverse event involving Xtampza ER, NUCYNTA, or NUCYNTA ER, please contact Collegium Medical Information directly at: drugsafety@propharmagroup.com or call (855) 331-5615. FDA MedWatch can be contacted directly at: https://www.accessdata.fda.gov/scripts/medwatch/index.cfm or by calling 1 (800) FDA-1088 or (800) 332-1088.