How often should i use a iontophotesis system for palmar hyperhidrosis starting out for what i consider severe?

Iontophoresis: In the early stages of treatment, the affected parts of the body should be treated once a day for about 10-15 minutes.  normally, 5-20 consecutive days of treatment sessions are sufficient to reduce the moisture content of the skin to a normal level.  after this initial treatment, the frequency of the sessions can usually be reduced to once or twice a week.

3-4 x/week: Start out 3-4 times/week, and than reduce frequency, if it works for you. Use it for 30 minutes at a time, and increase the ampage as much as you can tolerate.