I’ve had three courses of steroids (6 months apart). 50mg Prednisolone for two weeks. First time, like a cure! Foot drop gone, walking much better (for me!). Fatigue much diminished. Lasted three months. Second time, half as good and lasted a month. Third time, only fatigue slightly less for a short time.
NICE recommends a five day course of 500mg methylprednisolone. Would this be more effective?