UC San Diego Patch Continuously Tracks Parkinson’s Drug Levels in Sweat

Overview

• The study describing the fingertip patch was published in PNAS and released on Monday, July 27, 2026, reporting pilot data from healthy volunteers and a small group of people with Parkinson’s disease.
• The soft patch uses an osmotic hydrogel to draw passive sweat from the fingertip and enzyme-coated electrodes that generate a voltage proportional to levodopa concentration, so the device needs no battery to operate.
• Pilot results showed strong agreement between sweat-derived readings and high-performance liquid chromatography blood measurements, and in participants with Parkinson’s the patch’s levodopa signal tracked improving motor scores.
• Investigators found that people with Parkinson’s cleared levodopa from the blood faster than healthy controls, a finding that may explain sudden symptom drops between doses but requires larger studies to confirm.
• The team has approval to test extended-release and multiple-dose scenarios, plans to miniaturize the design into a ring and to explore links to drug pumps, yet they stress that larger, multi-visit validation is required before clinical use.