
Participant resources
Learn about the important role participants play in clinical trials and information to help you decide if joining a clinical trial is right for you.
Clinical Trials
Merck & Co, Inc, Rahway, NJ, USA, known as MSD outside of the United States and Canada, provides international versions of this site for both healthcare professionals and the general public.
Select a language below to be redirected to the MSD version of the site in your chosen language.
Latin America
Europe
Asia Pacific
Australia
Africa
If you’re not sure which area of focus you’re interested in, view all enrolling trials.

Learn about the important role participants play in clinical trials and information to help you decide if joining a clinical trial is right for you.

Learn what clinical trials are and how they work, and get answers to other common questions.