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To report an adverse reaction, product-related problem, or human exposure, please call Merck Animal Health Technical Services:

  • 800-224-5318  Companion Animal (Dogs, Cats, Horses)
  • 800-211-3573  Livestock & Aquaculture (Cattle, Swine, Dairy)
  • 800-219-9286  Poultry
Normal business hours are 8:30 am to 5:00 pm EST.

For after-hours emergencies, please call the numbers shown above. A recorded message will provide the telephone numbers for emergency support services if immediate assistance is needed.