Keytruda is a prescription medication used to treat various types of cancer, including melanoma, non-small cell lung cancer, head and neck squamous cell carcinoma, classical Hodgkin lymphoma, urothelial carcinoma, microsatellite instability-high cancer, and gastric cancer. As an immunotherapy drug, Keytruda works by helping the immune system recognize and attack cancer cells [3]. However, like any other medication, Keytruda may cause side effects, which can range from mild to severe [2].

The most common side effects of Keytruda include fatigue, nausea, diarrhea, decreased appetite, constipation, rash, itching, cough, difficulty breathing, fever, chills, headache, joint pain, muscle pain, and high blood pressure [2]. These side effects usually occur within the first few weeks of treatment and may go away on their own without medical intervention. Patients are advised to report any side effects to their healthcare provider immediately, especially if they are severe or persistent.

In some cases, Keytruda may cause more serious side effects, such as inflammation of the lungs, liver, kidneys, or colon, or problems with the endocrine system, such as the thyroid gland, pituitary gland, or adrenal gland. These side effects can be life-threatening and require immediate medical attention [2].

It is important to note that not all patients who receive Keytruda will experience side effects, and the severity and frequency of side effects may vary depending on the patient's age, health status, and the type and stage of cancer being treated. Patients should discuss the potential risks and benefits of Keytruda with their healthcare provider before starting treatment [3].

In conclusion, Keytruda is an immunotherapy drug used to treat various types of cancer. While it can be an effective treatment option, it may cause side effects ranging from mild to severe. Patients should report any side effects to their healthcare provider immediately, especially if they are severe or persistent. It is important to discuss the potential risks and benefits of Keytruda with a healthcare provider before starting treatment.

Sources:
[2] Keytruda. (n.d.). Side Effects. Retrieved from https://www.keytruda.com/side-effects/
[3] Cancer.net. (2021). Side Effects of Immunotherapy. Retrieved from https://www.cancer.net/navigating-cancer-care/how-cancer-treated/immunotherapy-and-vaccines/side-effects-immunotherapy
[1] Drug Patent Watch. (n.d.). Keytruda. Retrieved from https://www.drugpatentwatch.com/p/biologics/tradename/KEYTRUDA