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

  • Companion Animal Technical Services, 800-224-5318
  • Livestock Technical Services - cows, pigs, poultry, aquaculture, 800-211-3573
  • Equine Technical Services, 866-349-3497
  • For animal toxicity questions, call ASPCA at 888-426-4435

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.

For information about Merck Animal Health products, call 800-521-5767

For information about HomeAgain (microchips for dogs and cats), call 888-466-3242

If you would like to have more information on any of the subjects on the Merck Animal Health website, please fill in the form below.

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