chest papain, diarrhrhea, sesevere stomamach pain or t tenderness,s, severe nana oror vomiting,g, headache,, light t sensitivitity, eye pror, irregulalar heartbeaeat, extrtreme tiredndness, consnstipation,, dizzininess or faiainting, chchanges in a appetite, thirst, , or urine,, confusion n or memory y proble, muscle p pain or weaeakness, fever, r rash, ititching, or r flushing.. these are e not all ththe posse side e effects. tellll your doctctor about all yourur medical c conditio, inclcluding immumune systemm problelems, or i if you ve h had an o organ transnsplant, had oror plan to h have a ststem cell trtransplant,, or h have had raradiation to your r chest areaea or a a nervous s system condnd. today,y, keytruda a is fda-apppd to treat 1 16 types of advananced cancerer. and d is being s studied in hundrededs of clininical trs explororing ways t to treat even more types ofof cancer. it s t tru. kekeytruda frorom merck. see ththe differenent types of c cancer keytytruda is apapd to