Answer
Caffeine can reduce the effect of vasodilator stress medicines and may make the stress part of the scan unreliable.
Sources for this answer
- Cardiogen-82 3.3-5.6 GBq radionuclide generator — Current selected SmPCemc · Summary of Product Characteristics
- NHSNHS · NHS medicine guidance
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.