Hi, Bettina!

Welcome to NeuroTalk!
You're a good friend. Has your friend seen a neurologist? It seems like that would be an important step toward discovering the cause. Also, has his prescribing doc looked into the side-effects of his meds? The meds can often make symptoms appear.
You may also benefit from visiting our medications forum here:
http://neurotalk.psychcentral.com/forum72.html