Answer
Excessive numbness can impair the swallowing reflex. Seek medical advice rather than using it to self-treat existing swallowing difficulty.
Sources for this answer
- Covonia Sore Throat 0.2/0.05%w/v Oromucosal Spray Lemon Flavour — 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.