Contact Us

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 & Aquaculture (Cattle, Swine, Dairy, Aquaculture, Poultry)
866-349-3497 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 the telephone numbers for emergency support services if immediate assistance is needed.