Answer
They should not be used during menstruation because menstrual flow may wash the product out.
Sources for this answer
- Canesten Thrush Internal Cream 10% w/w vaginal cream — Current selected SmPCemc · Summary of Product Characteristics
- Canesten 500mg Pessary — 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.