over 40,000 of these patients have been prescribed opdivo. opdivo works with your immune system. opdivo can cause your immune system to attack normal organs and tissues in your body and affect how they work. this may happen any time during or after treatment has ended, and may become serious and lead to death. see your doctor right away if you experience new or worsening cough; chest pain; shortness of breath; diarrhea; severe stomach pain or tenderness; severe nausea or vomiting; extreme fatigue; constipation; excessive thirst or urine; swollen ankles; loss of appetite; rash; itching; headache; confusion; hallucinations; muscle or joint pain; flushing; fever; or weakness, as this may keep these problems from becoming more serious. these are not all the possible side effects of opdivo. tell your doctor about all your medical conditions, including immune system problems, or if you've had an organ transplant, or lung, breathing, or liver problems. because who wouldn't want...that? ask your doctor about opdivo. see opdivotv.com for this and other indications.