For US Healthcare Professionals
 
Prescribing Information for All Merck Products

Customer Service

Representatives are currently unavailable for live product discussions. Normal operating hours are:

Monday–Thursday 8:00 AM–Midnight ET
Friday 8:00 AM–6:00 PM ET
Saturday 8:00 AM–3:00 PM ET
(Hours subject to change for holidays.)

Please try again during normal business hours to connect with a Merck OnCall® representative

  • Request samples and vouchers for select Merck products
  • Obtain the latest product information for select Merck products
  • Have access to relevant clinical articles
  • Request educational materials for your patients
  • Receive assistance with registration for Merck eMedical Forums
  • Get answers to questions about diseases relevant to select Merck products

You can also choose one of our other customer service options.

Merck OnCall<sup>®</sup>

Adverse Event Reporting

If this is an emergency or you wish to report an adverse event with a specific Merck product, please call the Merck National Service Center at any time at:
1-866-342-5683

All product names listed on this site are registered trademarks owned by or licensed to a subsidiary of Merck & Co., Inc.
MerckProductServices, MerckServices, MerckSource, Merck OnCall, MerckMedicus, and MerckEngage are trademarks or registered trademarks of Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc.
COZAAR and HYZAAR are registered trademarks of E.I. du Pont de Nemours and Company, Wilmington, Delaware, USA

20953312(7)-02/10-EBS-PHY