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Related Experiment Video

Updated: Jul 10, 2026

Fabrication of Dissolvable Microneedle Patches Loaded with α-Lactalbumin Nanomicelles for Transdermal Capsaicin Delivery and Adipose Tissue Reduction

Fabrication of Dissolvable Microneedle Patches Loaded with α-Lactalbumin Nanomicelles for Transdermal Capsaicin Delivery and Adipose Tissue Reduction

Published on: December 30, 2025

A Fentanyl-Responsive Microneedle Patch for Harm Reduction.

Penghui Zhao^1,2, Zerui Zhou¹, Tyler Wolter^2,3

¹Department of Biological Systems Engineering, Virginia Tech, Blacksburg, Virginia, USA.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|July 9, 2026

Summary

This summary is machine-generated.

A novel fentanyl-responsive microneedle patch autonomously delivers naloxone when fentanyl is detected. This innovative harm reduction tool offers a potential safety net for opioid overdose, even in unwitnessed events.

Keywords:

Fentanyl Harm Reduction Microneedle Naloxone Responsive Delivery

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Fabrication and Characterization of Microneedle Patches for Loading and Delivery of Exosomes

Fabrication and Characterization of Microneedle Patches for Loading and Delivery of Exosomes

Published on: July 12, 2024

Area of Science:

Biomaterials Science
Nanotechnology
Pharmacology

Background:

Current opioid overdose interventions rely on bystander action, failing to address unwitnessed overdoses, a leading cause of fatalities.
Fentanyl's high potency and prevalence necessitate advanced, autonomous harm reduction strategies.

Purpose of the Study:

To develop an innovative fentanyl-responsive microneedle (MN) patch (iNal patch) for autonomous naloxone delivery.
To engineer a smart drug delivery system that responds dynamically to fentanyl levels for on-demand overdose intervention.

Main Methods:

Integration of naloxone-loaded mesoporous silica nanoparticles (MSNs) with fentanyl-sensitive aptamer modifications.
Development of a swellable maleated poly(vinyl alcohol) MN matrix for efficient skin penetration and drug release.
In vitro and in vivo testing in mice to evaluate overdose reversal and renarcotization prevention.

Main Results:

The iNal patch demonstrated effective reversal of fentanyl-induced opioid overdose symptoms in vivo.
Rapid restoration of normal physiological behaviors was observed in treated mice.
The system enabled multiple responsive naloxone release cycles, preventing renarcotization.

Conclusions:

The iNal patch represents a novel, materials-based approach to autonomous harm reduction for opioid overdose.
This microneedle platform offers a potential safety net for at-risk populations, operating independently of human supervision.
The study establishes a new paradigm for responsive drug delivery systems in emergency medicine.