Motorthead, the maximum dosage for Pred is 1 mg/day/kg of weight, I went up to 75 mg/d for 75 kg.
You are also on Mestinon but do you take immunosuppressors like Cellcept or Imuran? These are usually necessary to be able to taper off Pred later on since one cannot go on at those doses and as they are pretty slow acting, they have to be taken early at the same time as Pred.
Maurice.