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Find information on animal health topics, written for the veterinary professional.

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Contact the Merck Vet Manual Staff

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Contact the Merck Vet Manual

Adverse Event Reporting

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)

800-211-3573  Livestock (Cattle, Swine, Poultry & Aquaculture)

866-349-3497  Equine (Horses)

888-466-3242  HomeAgain

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 telephone numbers for emergency support services if immediate assistance is needed.