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By Shailee Mahajan
Opioid overdose is an event that killed almost 45,000 people in the US in 2025, and while death rates have been declining since 2023, overdose is a problem that still plagues the US and the world. However, recent research has introduced a small, penny-sized patch that may be able to reverse fentanyl and opioid overdose, and it has the potential to save thousands of lives.
Researchers at Virginia Tech’s department of Biological Systems Engineering have developed a wearable microneedle patch that can detect fentanyl in the body and immediately release naloxone, a medication that can reverse an opioid overdose and is regularly manually administered to overdose patients. This technology could be revolutionary as it could reduce the urgency of having a capable bystander who knows what to do in the event of an overdose.
The patch is called the iNal patch, and it contains 121 microscopic needles that reach far enough to access fluid under the skin without damaging tissue. The patch itself has porous silica nanoparticles that hold naloxone, which blocks the effect of opioids. When the patch detects fentanyl, it releases naloxone, releasing more medication with higher concentrations of the drug. The naloxone will only be released after opioid concentration reaches a certain threshold, since opioids are commonly prescribed for pain relief and overdosing is frequent is a patient is confused about dosing. The patch retains naloxone after a use, making it function multiple times. This is significant because the effects of fentanyl may last longer than that of naloxone, so more medication may be needed as the effects wear off.
In the future, this patch could be adapted to work for other opioids and release different medications for specific situations. The patch shows reliable results in early testing, detecting and responding quickly to fentanyl in the bloodstream and continually releasing naloxone for up to 24 hours. It was tested on mice and successfully reversed overdoses. The project began in 2022, and may soon be ready for clinical trials on patients.
Sources:
Hughes, Brianna. “Wearable smart patch could deliver automatic aid during a fentanyl overdose.” Virginia Tech News, 2026, https://news.vt.edu/articles/2026/08/cals-naloxone-patch.html. Accessed 24 August 2026.
Xing, Y., Yang, Y., Li, X. et al. A wearable acoustofluidic patch for rapid reversal of opioid overdose. Nat Commun (2026). https://doi.org/10.1038/s41467-026-77033-x
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