Answer
Rarely, an allergic reaction or the sulphur dioxide in the selected formulation can cause bronchospasm or serious breathing difficulty. Stop taking it and seek emergency help if this occurs.
Sources for this answer
- PegLax 10 g powder for oral solution in sachet — 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.