Learn about KEYTRUDA® (pembrolizumab), an immunotherapy that works with your immune system to help fight certain cancers. Visit the patient website.

Learn how KEYTRUDA® (pembrolizumab) works with your immune system to help fight cancer cells. Watch two videos about immunotherapy and how it works in the body.

KEYTRUDA is a prescription medicine used to treat: a kind of lung cancer called non–small cell lung cancer (NSCLC).

View tips and resources that may help while receiving KEYTRUDA® (pembrolizumab) including what to expect with your first infusion appointment and what to know about your treatment schedule.

If you are unable to afford KEYTRUDA, Merck may be able to help. Contact The Merck Access Program at 855-257-3932 . Need more information about whether your insurance provider covers KEYTRUDA or about potential financial assistance options?

Find answers to frequently asked questions about KEYTRUDA® (pembrolizumab) including how does KEYTRUDA work, PD-L1 testing information, and more.

Learn about the side effects that may occur while taking KEYTRUDA® (pembrolizumab). Review serious side effects and common side effects with KEYTRUDA.

Learn about an immunotherapy treatment option that may help certain people facing head and neck squamous cell cancer at keytruda.com.

If you’ve recently been prescribed KEYTRUDA, the quick start guide for KEYTRUDA gives you step-by-step information to help you prepare for your treatment, become familiar with possible side effects, and more.

See how long treatment takes and other information on what to expect when taking KEYTRUDA® (pembrolizumab).