Answer
Yes. It can increase susceptibility, mask symptoms and make infections more severe. Seek prompt advice after exposure to chickenpox, shingles or measles.
Sources for this answer
- NHSNHS · NHS medicine guidance
- Dexamethasone 2mg Tablets — 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.