Iontophoresis is used for which purpose?

• A. Drug Delivery Through Skin
• B. Electrical Stimulation of Muscle
• C. Nerve Conduction Testing
• D. Impedance Measurement

Answer: (A)

Iontophoresis uses a small direct current to move charged drug molecules through the skin and into underlying tissues, enabling local, noninvasive drug delivery. The electric field repels ions of the same charge as the active electrode and carries the medication across the skin barrier to achieve targeted treatment, often for anti-inflammatory drugs, anesthetics, or other ionizable agents. This method delivers medication locally with minimal systemic exposure. It is not a method for stimulating muscles, testing nerve conduction, or measuring impedance—the purposes of those techniques involve eliciting tissue responses or assessing electrical properties rather than driving drug molecules through the skin.