Answer
A cancer team gives it either as an infusion into a vein or as an injection under the skin, depending on the prescribed formulation and clinical circumstances.
Sources for this answer
- KEYTRUDA 25 mg/mL concentrate for solution for infusion — Current selected SmPCemc · Summary of Product Characteristics
- KEYTRUDA 395 mg solution for injection — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.