I'm having the Botox injection next month.

To expound on my prior answer. I took Stalevo for several years. I cannot say whether it has inherently any affect on my drooling or not. I haven't taken Stalevo for about 2 years now. Regardless of which or any medications that I've taken, drooling has continued to be more of a problem, especially when my meds are "on" too much, or when I'm really "off". I rarely have any feeling or sense of thirst. Dehydration is a constant battle, and had been for years. I was diagnosed in early 2007. I'm hoping that the injection helps with the drooling as well as the thirst issue. I hope my answers help your question.
JDH

Thanks, John, for your time and consideration. Please come back and let me know how the "Botox" thing goes....