Answer
Stop using it and seek advice from a doctor, dentist or pharmacist if the condition worsens, does not improve, or recurrent or persistent oral ulcers remain unexplained.
Sources for this answer
- Benzydamine Hydrochloride 0.15 % w/v Oromucosal Spray — 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.