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