Answer
Only a product specifically formulated and labelled for nasal use should be applied carefully in and around the nostrils. Other levomenthol products must not be used there.
Sources for this answer
- Happinose 0.3% Ointment — 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.