MSD corporate headquarters
2000 Galloping Hill Road
Kenilworth, NJ 07033 U.S.A.
8:30 a.m. to 5:30 p.m., ET
MSD is known as Merck & Co., Inc., Kenilworth, NJ, USA within the U.S. and Canada
To inquire about invoice and payment issues, please contact the appropriate country’s help desk.