Answer
New diarrhoea should be reported promptly because it may represent immune-related colitis. Blood or mucus in stools, abdominal pain, frequent diarrhoea or worsening symptoms need urgent assessment, including consideration of infection.
Sources for this answer
- OPDIVO 10 mg/mL concentrate for solution for infusion — Current selected SmPCemc · Summary of Product Characteristics
- UK GovernmentUK Government · Reputable Web