Since 1891, we’ve been guided by medical innovations and a mission of developing lifesaving treatments

Our work in cardiovascular diseases (diseases of the heart and blood vessels), MMR and pneumococcal vaccines, HIV, type 2 diabetes, and cancer has made tremendous impacts. Today we focus on scientific innovation to deliver medicines and vaccines that help millions of people around the world. We are committed to staying true to the philosophy of our founder, George W. Merck: Medicine is for the patients. Medicine is for the people.


How are we advancing clinical research?

MSD is now conducting research across 7 key health areas:

  • Cardiovascular diseases
  • Diabetes and endocrinology
  • Infectious diseases
  • Neurosciences
  • Oncology
  • Respiratory and immunology
  • Vaccines

Why are clinical trials important?

Our progress is due in large part to the important and tough scientific questions we set out to answer with our trials and, of course, the help of many participants who join our clinical trials.

View all trials that are enrolling participants

What we’ve done and what we’re doing

We run to, not from, the world’s biggest health challenges.

More than


current clinical trials across 7 areas of focus

Vaccines for


of the 17 diseases on the CDC’s recommended vaccination list


years of being committed to HIV research

More than


clinical trials involving cancer medicines

More than


years of helping people living with cardiovascular disease

Our commitment to patient safety in clinical trials

MSD’s role is to develop and provide innovative products and services that save and improve lives. Our clinical trials are designed, conducted, and monitored to follow local laws, ethical principles, and international standards that include:

Our clinical trial ethics public policy statement has more information on how we safely conduct our trials and ensure patient standard of care.

Diversity in our clinical trials

MSD understands the importance of enrolling diverse participants in clinical research. And it’s about more than diversity, it’s also about equity.

See how we’re promoting diversity in clinical trials


Since the start of the COVID-19 pandemic, we’ve made it our priority to work with other companies and countries to drive testing and treatment for COVID-19. We collaborate with our industry partners to help ensure advancement of COVID-19 treatments.

See more of what we’re doing to fight COVID-19