Low-tech handheld device detects counterfeit drugs

Scientists at the Centers for Disease Control and Prevention (CDC) have adapted a simple low-tech device normally used to examine urine specimens to test and detect counterfeit drugs.

They report their results on a method to test malaria drugs today at the 50th Annual Meeting of the American Society of Tropical Medicine and Hygiene in Atlanta.

"Counterfeit malaria drugs are a widespread problem in many parts of the world, especially in southeast Asia ," says Michael D. Green, a chemist in the CDC Division of Parasitic Diseases and the presenting author of the study. "A survey in southeast Asia determined that 38% of samples of the malaria drug artesunate purchased at retail outlets contained no active ingredients whatsoever." In 1999 at least 30 malaria deaths in Cambodia could be linked to inadequate treatment due to counterfeit drugs.

The device, called a handheld refractometer, has been commonly used by clinics to measure the specific gravity of urine specimens. Green and his colleagues realized that by measuring the specific gravity of certain dissolved drugs, one could easily determine the amount of active ingredient in a tablet. While not able to conclusively identify an unknown drug, the device could be used as a first line of defense to identify counterfeits.

The test is simple and the refractometer is relatively inexpensive with adequate devices costing less than $100. The tester simply takes a sample of the medication (usually a tablet), pulverizes it, dissolves it in alcohol and filters out any solids left.

A drop of the clear solution is placed on the refractometer, which casts a shadow line giving the refractive index. That index can be converted to specific gravity, which is compared to a standard already established for that particular drug.

"This is a simple, relatively low-tech approach that people in developing countries who have limited resources can use," says Green. So far,

Contact: Jim Sliwa
American Society for Microbiology

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