Answer
Yes. They can suppress the skin response and cause a false-negative result. Follow the clinic’s instructions and do not stop prescribed treatment without advice.
Sources for this answer
- Soluprick SQ Grass Pollen Phleum pratense (Timothy Grass) 10 HEP — 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.