extreme titiredness, constipapation, didizziness oror fainting,, changeges in appetetite, ththirst, or u urine, confusioion or memorory proble, musclele pain or w weakness, fever, r rash, itchching, or flushing. these are not alll the e possible s side effect. tell youour doctor a about al your m medical cononditions includuding immune system problelems, or if you ve had an organ transplant, hahad or plan n to have a stem cell transplant oror have had d radiationn to y your chest t area or a n nervous sysystem condition.n. it feelsls good to be here for them.. living lononger is posossibl. it s t tru. kekeytruda frorom merck. asask your d doctor ababout keytruruda.