Keytruda is a prescription medicine that is used to treat various types of cancer, including melanoma, non-small cell lung cancer, head and neck cancer, classical Hodgkin lymphoma, primary mediastinal large B-cell lymphoma, urothelial carcinoma, microsatellite instability-high cancer, gastric cancer, cervical cancer, and hepatocellular carcinoma [1]. The drug works by blocking the PD-1 pathway, which helps the body's immune system fight cancer cells. However, Keytruda can cause side effects that can range from mild to severe.

The side effects of Keytruda are similar to those of other immunotherapy drugs, which can include fatigue, skin rash, itching, diarrhea, nausea, loss of appetite, muscle and joint pain, and fever. In some cases, Keytruda can also cause more serious side effects, such as pneumonitis, colitis, hepatitis, endocrinopathies, nephritis, and severe skin reactions [2].

While it may not be possible to completely prevent side effects from Keytruda, there are ways to manage them. Patients should inform their doctors immediately if they experience any side effects, as some can be life-threatening if left untreated. Doctors may adjust the dose of Keytruda or temporarily stop treatment to manage side effects. In some cases, patients may need to take other medications to treat side effects, such as corticosteroids for inflammation or antidiarrheal drugs for diarrhea [3].

In conclusion, Keytruda is a medication used to treat cancer, but it can cause side effects that range from mild to severe. While it may not be possible to prevent all side effects, patients can work with their doctors to manage them. If you are taking Keytruda and experience any side effects, it is important to inform your doctor immediately to ensure proper treatment.

Sources:
[1] https://www.drugpatentwatch.com/p/biologics/tradename/KEYTRUDA
[2] https://www.cancer.net/navigating-cancer-care/how-cancer-treated/immunotherapy-and-vaccines/side-effects-immunotherapy
[3] https://www.keytruda.com/getting-started/side-effects/