Technical experts are available to answer your questions Monday through Friday between 8 AM and 7 PM ET. Please call us at:
1-800-489-5119
You're welcome to leave a voicemail message after business hours; we'll return your call by the end of the next business day.
Or, please fill in the form below and submit it any time day or night.
If you are a physician, pharmacist, or other healthcare provider, you may have a question, need information, or wish to report an adverse experience with a specific Merck product or service. Please call the Merck National Service Center at:
1-877-637-2521
We are pleased to assist you Monday through Friday from 8 AM to 7 PM ET. Adverse experiences and product-related emergencies will be handled at any time.
Forgot Sign In Information?
Visit our help page for answers to other technical questions
