How to Report Animal Drug Side Effects and Product Problems

1.  You should call the product manufacturer.  In some countries, there is an option to email, but calling is preferred. Insist on getting a case number!

  • BRAVECTO / Merck USA (Merck/MSD Animal Health) 

  • NEXGARD / Merial USA 
1-888-MERIAL1 (637-4251) (Option 3) The hours of operation are Monday-Friday 8 am-6 pm (ET).

  • TRIFEXIS / Elanco USA

2.  Second , you should file a report with the FDA.  For more information on filing a report go to: