Answer
It can rapidly suppress breathing, lower blood pressure, slow the heart and cause muscle rigidity, so immediate respiratory and cardiovascular support must be available.
Sources for this answer
- Remifentanil 5 mg powder for concentrate for solution for injection or infusion — 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.