Dad (65yrs) gets headache if don't take prednisolone (15mg/day). Doctors suspect idiopathic meningitis or sjogren syndrome. How to stop prednisolone?

See your doctor. His doctor may need to taper his Prednisone as it not advise to stop Prednisone suddenly. However; his underlying condition will determine whether or not he can taper his Prednisone dose.