My RO and MO were real big on Salagen (Pilocarpine) so I dutifully tried to take them the 4 times a day prescribed. However, it really triggered nausea and vomiting so I went down to 3 then 2 a day during treatment. I was able to quit the anti-nausea pills then. Once TX was done, I went back up to 3 and finally hit 4 until about 5 months out when they said no real benefit to continue. In my case, it did seem to work, as at one year out, my dry mouth gets better every day and the prothodontist even had to use the suction during my most recent crown preparation - when in the past I had been bone dry.
Still use biotene spray and mouthwash during the day.