How Iontophoresis Works: A Complete Guide
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Time to read 3 min
Iontophoresis has been used to manage excessive sweating since the 1940s. Despite its long track record, many people living with hyperhidrosis in Australia and New Zealand have never heard of it, or assume it sounds more complicated than it is. This guide explains how iontophoresis works, what a treatment session actually involves, and what you can realistically expect.
What Is Iontophoresis?
Iontophoresis is a non-invasive, drug-free treatment for primary hyperhidrosis. It delivers a mild, controlled electrical current through ordinary tap water to the area being treated: the hands, feet, or underarms. Over a course of sessions, this process works to temporarily reduce sweat secretion in the treated areas. Iontophoresis is one of the most widely recommended treatments for palmar, plantar, and axillary hyperhidrosis, and is used in clinics and at home all over the world.
How Does It Work?
The exact mechanism of iontophoresis is still an area of ongoing research. The most widely accepted explanation is that the electrical current used during iontophoresis disrupts the connection between the sweat-stimulating nerves and the sweat glands, reducing the glands' ability to respond to those signals. Importantly, the sweat gland itself is not damaged. Only the nerve signalling pathway is affected. This is why the iontophoresis treatment needs to be repeated regularly to maintain results, and why the effect is fully reversible.
What Does a Session Look Like?
For hands and feet, two trays are filled with tap water. Electrodes are placed beneath foam mats in each tray. You then place your hands or feet in the water, and the iontophoresis device delivers a controlled current between the two electrodes. The current is gradually increased to a level where you feel a mild tingling, and never to the point of pain. For underarms, the process uses sponge pads soaked in water, placed into the armpits. The same principles apply: a mild current, adjusted to your comfort level.
Treatment Phases and Session Times
Treatment is structured in phases, each with a specific purpose and frequency.
Initial Phase 1: Establishing the Effect (10 to 14 days)
The first phase of iontophoresis focuses on establishing the therapeutic response in one area at a time. Sessions are done daily for 10 minutes, or four times per week for 15 minutes. Direct current is recommended in most cases as it tends to be more effective, though pulsed current is available for those with sensitive skin. During this phase, current direction remains constant.
Initial Phase 2: Reducing and Normalising (3 to 4 weeks)
Once an initial response is established, the second part of the initial phase continues at the same frequency: daily for 10 minutes or four times per week for 15 to 20 minutes, but now with the current direction reversed regularly, either manually or using the AUTO setting on the Saalio. This ensures even treatment across both sides of the area.
Maintenance Phase: Long-Term Control
Once sweating has reduced to a level you're happy with, most people need only one session of iontophoresis per week at 15 to 20 minutes to maintain results. This phase continues for as long as you want to keep the effect going.
Current Settings: Starting Low and Building Up
Always begin at a low current of 1 to 3 mA and increase gradually during each session until you feel a mild tingling. The current should never feel painful. Tolerance often increases over time. Feet are typically the least sensitive area; underarms tend to be more sensitive. The Saalio iontophoresis device allows precise adjustment in milliampere units so you stay in full control.
Is It Safe?
Iontophoresis has an excellent safety record when used as directed. The Saalio® iontophoresis device is a medically certified device distributed in Australia and New Zealand by SudorCure in compliance with TGA regulatory requirements. Like any medical treatment, iontophoresis is not suitable for everyone. There are contraindications including pregnancy, pacemakers, and certain metal implants, which are detailed fully in the device's instructions for use. Minor side effects can include temporary skin redness, tingling during sessions, or dryness after treatment. Applying a moisturiser after each session helps manage any dryness.
If you have any health conditions you're unsure about, it's worth checking with your GP before starting. You are also welcome to reach out to us at hello@sudorcure.com and we can help point you in the right direction.