Contact the Merck Vet Manual Staff
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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)
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.