Keytruda (pembrolizumab) is a medication used in the treatment of various types of cancer. While it is generally well-tolerated, there are potential side effects associated with its use. However, it is important to note that the sources provided do not specifically mention any side effects unique to Keytruda. Instead, they provide general information about the side effects of immunotherapy, of which Keytruda is a type.

According to the sources, the side effects of immunotherapy, including Keytruda, can vary depending on the individual and the specific type of cancer being treated. Some common side effects of immunotherapy include fatigue, skin rash, itching, diarrhea, nausea, loss of appetite, and muscle or joint pain. These side effects are generally mild to moderate in severity and can be managed with appropriate medical care.

In some cases, immunotherapy can cause more serious side effects known as immune-related adverse events (irAEs). These irAEs occur when the immune system mistakenly attacks healthy organs or tissues. Examples of irAEs include pneumonitis (inflammation of the lungs), colitis (inflammation of the colon), hepatitis (inflammation of the liver), and endocrinopathies (disorders of the endocrine system).

It is important to note that the occurrence of these side effects is relatively rare, and most patients receiving Keytruda do not experience them. However, it is crucial for patients to be aware of the potential side effects and to promptly report any unusual symptoms to their healthcare provider.

In summary, while the sources provided do not mention any side effects unique to Keytruda, they do highlight the potential side effects of immunotherapy in general. It is important for patients to be informed about these potential side effects and to seek medical attention if they experience any concerning symptoms.

Sources:
[1] Drug Patent Watch. (n.d.). Keytruda. Retrieved from https://www.drugpatentwatch.com/p/biologics/tradename/KEYTRUDA
[2] Keytruda. (n.d.). Side Effects. Retrieved from https://www.keytruda.com/side-effects/
[3] Cancer.Net. (n.d.). Side Effects of Immunotherapy. Retrieved from https://www.cancer.net/navigating-cancer-care/how-cancer-treated/immunotherapy-and-vaccines/side-effects-immunotherapy