This is an old article in the BMJ by Huw Morris et. al.
He went on to become Professor at the University College London Hospital (World class neurology department) where he specialises in PSP and works alongside the research wing. From posts I think he sees a number of people here... great guy!
The article goes through a description of the illness, its progression, management. and treatment.
On treatment he mentions L-dopamine and cholinergic treatment. Nether of which he thinks very helpful.
We see him and he hasn't prescribed anything - which I think says a lot.
You can access the article here:
dropbox.com/sh/jcft9zk4ext3...
Please let me know if the cloud link doesn't work.