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Contact Us

Thank you for your interest in learning more about our company. In an effort to answer your inquiries, the following information is provided for your convenience.

Frequently Asked Questions

Here you'll find the answers to some Frequently Answered Questions.
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Product Inquiries

For product information, please visit our products page.

To report an adverse experience with a specific Merck human health product, please call the Merck National Service Center at 1-800-444-2080. The Merck National Service Center is pleased to assist you Monday through Friday from 8 a.m. to 7 p.m., ET., and product related emergencies can be reported at any time.

Animal Health Product Inquiries

To report an adverse reaction or if you have a product-related question, please call Merck Animal Health Technical Services:

For Companion Animal (dogs, cats), please call 1.800.224.5318 Monday-Friday during the hours of 8:30 a.m. to 5 p.m. EST.

For Livestock, Poultry & Aquaculture (cattle, swine, dairy, poultry & fish), please call 1.800.211.3573 Monday-Friday during the hours of 8:30 a.m. to 8 p.m. ET.

For Equine (horses), please call 1.866.349.3497 Monday-Friday during the hours of 8:30 a.m. to 5 p.m., ET.

Merck Corporate Headquarters

2000 Galloping Hill Road
Kenilworth, NJ 07033 U.S.A.

Phone: 908-740-4000
Monday-Friday
8:30 a.m.to 5:30 p.m., ET

Merck in canada

16750, Trans-Canada Highway Kirkland, Quebec H9H 4M7 Canada
+1 514 428-7920

Visit Merck in Canada

Worldwide offices

Merck is known as MSD outside the US and Canada.