It's always a good idea to discuss any change in your treatment with your doctor. There are actually two trials for Duodopa - the one for advanced patients and one to test the gel against oral medications.
see here
http://www.pdtrials.org/en/browse/all/view/249

Check out more details on the one for advanced patients here:
http://www.clinicaltrials.gov/ct2/show/NCT00335153

they give you a contact - your doctor's office may be able to help you.

Good luck and keep us posted!

Peggy