Contact us

U.S. Merck corporate headquarters

See all locations

Our corporate headquarters is located at:

126 East Lincoln Avenue
P.O. Box 2000
Rahway, NJ 07065 USA

To reach a Merck employee, please call:

Monday – Friday, 8:30 am – 5:30 pm ET

Worldwide offices

To learn about our operations in Canada, visit For outside of the U.S. and Canada, Merck is known as MSD. For contact information, please visit here.

Products & services and adverse event reporting

For information about Merck’s products and services including the reporting of an adverse event or product quality complaint with a specific Merck product, please call the Merck National Service Center:

Monday – Friday, 8:00 am – 7:00 pm ET

You can call this number 24/7 for any product-related emergency

Do you need help paying for your medications?

See programs

We understand that many things can add to the stress of medical treatment. If you are unable to afford your prescribed medications, we may be able to help you. See what programs are available to eligible patients in the U.S.

For investor questions:

Call: +1 908-740-1468


For general media questions:

Call: +1 908-740-5633


To inquire about invoice and payment issues, please visit our site for suppliers.

Merck Animal Health

Visit Merck Animal Health website

If you are based in the USA and have questions on our products or our organization, please visit the Merck Animal Health USA contact page.

If you are outside the USA, please send an email to:

Our Merck Animal Health headquarters is located at:

2 Giralda Farms
Madison, NJ 07940 USA

Contact information for Stockholders and Investors is available here.