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Merck Manual
Veterinary Manual
The trusted provider of veterinary information since 1955

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Content last modified Feb 2019

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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.

Merck & Co., Inc., Rahway, NJ, USA (known as MSD outside of the US and Canada) is dedicated to using the power of leading-edge science to save and improve lives around the world.  The Merck Veterinary Manual was first published in 1955 as a service to the community.  The legacy of this great resource continues as the Merck Veterinary Manual in the US and Canada and the MSD Vet Manual outside of North America.

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