Welcome to HCM forum.
Yes wysolone( prednisolone
) is an oral steroid and has many systemic sideeffects.
However a short course ( 5 days ) is not very harmful and prescribed in many allergic conditions if other anti allergy
medications especially local steroids
antihistamine ( levocetrizine etc) have failed to provide relief. So please discuss your fears with your doctor and if that is the last alternative treatment for your condition then do go ahead with it.
Hope I have answered your query.
Wishing you good health.