Low Cost Sensor Invention From UC Riverside Identifies Counterfeit Medications by Tracking Pill Dissolution Rates

A $30 device from UC Riverside uses infrared sensors to identify counterfeit medications by tracking their unique digital dissolution fingerprint.

By: AXL Media

Published: Mar 20, 2026, 9:24 AM EDT

Source: Information for this report was sourced from University of California - Riverside

Addressing the Global Crisis of Substandard Pharmaceuticals

The World Health Organization estimates that approximately one in ten medications globally, ranging from life saving cancer treatments to common contraceptives, are either counterfeit or substandard. While this issue primarily impacts developing nations, a growing gray market in the United States for weight loss and anti-aging drugs has also led to serious injuries and fatalities. In response, William Grover, an associate professor of bioengineering at the University of California, Riverside, has developed a low cost detector designed to verify the authenticity of pills. By focusing on the physical behavior of a medication rather than its complex chemical makeup, the device offers a practical solution for identifying illicit versions of popular pharmaceuticals.

Repurposing Toy Technology for Medical Safety

The core of this new diagnostic tool is an infrared sensor originally manufactured for toy robots that follow lines on paper. The UC Riverside team repurposed these inexpensive components to track the specific rate at which a pill dissolves in a cup of water. Because legitimate medications are manufactured under strict, uniform conditions, every authentic pill of a given brand should dissolve at roughly the same rate. This process creates a unique "fingerprint" based on the ingredients and manufacturing techniques used by the original producer. According to Grover, if a suspect pill dissolves at a different rate than a verified sample, it is a clear indicator that the product is a counterfeit.

Creating a Library of Digital Disintegration Fingerprints

The researchers have moved beyond simple observation by converting the dissolution process into a digital signature. In their study, the team tested over 30 different types of medications, including antibiotics, prescription opioids, and over the counter painkillers. Their findings, published in the journal Analytical Chemistry, revealed that 90 percent of these pills could be correctly identified using this fingerprinting method. This digital library allows for a high degree of sophistication in testing, ensuring that even minor variations in a pill's composition can be flagged as a potential risk to the consumer.