Two more items on budipine:

from 1986
http://www.springerlink.com/content/q65m76n526027107/

from 1999 (see item #2)

http://apps.who.int/medicinedocs/fr/d/Jh1466e/2.6.html#Jh1466e.2.6

It seems to me that with screening for contraindications, budipine could offer another choice that might add one more stop on the way to DBS.

Kathleen