Hi,
I think you should continue using the unit if you noticed at least some improvement. Some people need longer to get the best iontophoresis results, so it's possible that you could still reap better results from this hyperhidrosis treatment.
Have you tried doing as R.A. Fischer support recommended, and increase the mA to 20 and the treatment time to 30 minutes? Some of the iontophoresis reviews recommend experimenting with different settings to achieve the best results. If that fails to improve things, you can for instance try adding baking soda into the water – because sometime the water quality affects the efficiency of iontophoresis.
Do you feel tingling during treatments? If your iontophoresis feels super smooth and you don't feel a single thing, then it's possible that your settings are not high enough. However, iontophoresis should never be notably unpleasant or painful! (So be careful there.)
And, lastly, if you do try adding Robinul to water, the recommended dose would be 500 mg per tray when there is 1 litre of water per tray (= 0.05% concentration). I don't have any personal experience with this, so let's wait for someone else to hopefully add more insight. 🙂
And I wanted to ask – are you only using iontophoresis for sweaty hands? (Which I concluded from the sweaty hands in handshakes that you mention) Or do you also use the device for your feet?