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Prescribing Information for All Merck Products
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Customer Service

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

Monday–Thursday 8:00 AM–Midnight ET
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(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
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  • 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

COZAAR and HYZAAR are registered trademarks of E.I. du Pont de Nemours and Company, Wilmington, Delaware, USA
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All other brand names are registered trademarks of Merck & Co., Inc.
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20752836(1)-11/07-EBS-PHY