What should you know about iontophoresis voltage?

Voltage helps the unit deliver current through water or treatment pads, but the number shown on one device cannot be compared directly with every other device. Skin contact, water composition, electrode position and individual sensitivity all affect the sensation. A mild tingling feeling can occur; sharp pain or burning is not a target. The treatment is generally used for [Excessive Sweating](/symptoms/excessive-sweating/) in selected areas. Device details are covered in [Iontophoresis Device](/technology/iontophoresis-device/).

Begin at the setting recommended for your device and increase only in small steps if directed. Ensure the skin is evenly in contact with the water or pads, and keep cuts, eczema flares and other irritated areas out of treatment. Do not change polarity or electrical settings casually. A clinician can help tailor the plan and compare [Iontophoresis](/treatments/laser-and-energy/iontophoresis/) with options such as [Botox For Sweating](/treatments/injectables/botulinum-toxin-for-hyperhidrosis/).

Stop if you feel burning, severe pain, blistering, swelling or intense redness. Contact a clinician if a reaction persists after treatment. Medical assessment is also appropriate for sweating that starts suddenly, is widespread or occurs at night, especially with fever, weakness, faintness, chest symptoms or unexplained weight change.

What setting and polarity fit my device and treatment area? How can I tell normal tingling from skin injury? Should I change the plan if my skin is dry, cracked or unusually sensitive?