Keytruda

Moderate Warnings

Generic: pembrolizumab

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Information reviewed July 24, 2026

Rank #7 in US TV Ads
Class: PD-1 Inhibitor (Immunotherapy)

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What is it for?

Keytruda is an immunotherapy drug used to treat many types of cancer including melanoma, lung cancer, and others. It helps the body's immune system detect and fight cancer cells.

Primary Condition

Multiple cancers

How it works

Keytruda is a PD-1 inhibitor. Cancer cells can hide from the immune system by using the PD-1 pathway. Keytruda blocks this pathway, allowing the immune system to recognize and attack cancer cells.

Common Side Effects

This is not a complete list of side effects. Always consult with a doctor.

  • Immune-related side effects
  • Fatigue
  • Rash
  • Diarrhea
  • Hormone gland problems
  • Pneumonitis
  • Colitis

Keytruda FAQs

What is Keytruda used for?

Keytruda (pembrolizumab) is a prescription medication used to treat Multiple cancers. Keytruda is an immunotherapy drug used to treat many types of cancer including melanoma, lung cancer, and others. It helps the body's immune system detect and fight cancer cells.

How does Keytruda work?

Keytruda is a PD-1 inhibitor. Cancer cells can hide from the immune system by using the PD-1 pathway. Keytruda blocks this pathway, allowing the immune system to recognize and attack cancer cells.

What are the common side effects of Keytruda?

Commonly reported side effects of Keytruda include Immune-related side effects, Fatigue, Rash, Diarrhea, Hormone gland problems, Pneumonitis, and Colitis. This is not a complete list — tell your doctor or pharmacist about any side effects you experience.

Does Keytruda have any serious warnings?

Keytruda has notable warnings and precautions. Tell your doctor about your medical history and any other medicines or supplements you take before starting Keytruda.

What is the generic name for Keytruda?

The active ingredient in Keytruda is pembrolizumab, which belongs to a class of medicines known as PD-1 Inhibitor (Immunotherapy).

Who makes Keytruda?

Keytruda is manufactured by Merck. It was first approved in 2014.

How can I save money on Keytruda?

You may be able to lower the cost of Keytruda by using a free pharmacy discount card or by comparing prices across pharmacies before you fill your prescription. Savings vary by pharmacy and location.

Common questions about Keytruda

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Quick Facts

Manufacturer

Merck

Year Approved

2014

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