• Fever

  In children, when KEYTRUDA is used alone, fever, vomiting, upper respiratory tract infection, headache, and low levels of white blood cells and red blood cells (anemia) are more common than in adults. [keytruda.com]

• Swelling

  Kidney problems: decrease in the amount of your urine; blood in your urine; swelling of your ankles; loss of appetite. [keytruda.com]

• Diarrhea

  Intestinal problems: diarrhea (loose stools) or more frequent bowel movements than usual; stools that are black, tarry, sticky, or have blood or mucus; or severe stomach-area (abdomen) pain or tenderness. [keytruda.com]

• Nausea

  Liver problems: yellowing of your skin or the whites of your eyes; severe nausea or vomiting; pain on the right side of your stomach area (abdomen); dark urine (tea colored); or bleeding or bruising more easily than normal. [keytruda.com]

• Vomiting

  In children, when KEYTRUDA is used alone, fever, vomiting, upper respiratory tract infection, headache, and low levels of white blood cells and red blood cells (anemia) are more common than in adults. [keytruda.com]

• Flushing

  Signs and symptoms of infusion reactions may include chills or shaking, itching or rash, flushing, shortness of breath or wheezing, dizziness, feeling like passing out, fever, and back pain. Rejection of a transplanted organ. [keytruda.com]

Getting medical treatment right away may help keep these problems from becoming more serious. Your health care provider will check you for these problems during treatment with KEYTRUDA. [keytruda.com]