Georgia Tech assistant professor Facundo Fernandez and his students are studying new, high-throughput screening techniques to detect and quantify the contents of counterfeit anti-malarial drugs and other fake pharmaceuticals. Photo by
A worsening epidemic of sophisticated anti-malarial drug counterfeiting in southeast Asia and
The situation has prompted an international group of researchers to urge national and international authorities to combat the problem with stringent regulations, law enforcement and the provision of inexpensive medicines to undercut the counterfeiters. Based on their own research and other scientists studies, they outline the problem and make recommendations for addressing it in a paper published
The manufacture and distribution of counterfeit drugs, including anti-malarials, is a massive international problem, and few agencies are investigating it, said Facundo Fernandez, an assistant professor of chemistry and biochemistry at Georgia Tech and an author on the paper. His collaborators include scientists Paul Newton from the
Malaria is a widespread international problem, primarily in poor and developing countries in the tropics though some cases have been reported in
The percentage of over-the-counter counterfeit artesunate tablets containing no artesunate apparently increased from 38 to 53 percent in southeast Asia between 1999 and 2004, according to a studies led by Newton and Professor Nicholas White at Oxford. In some countries, the majority of the available artesunate is fake, according to the
Meanwhile, identifying counterfeit tablets has become increasingly difficult as counterfeiters have implemented sophisticated manufacturing and packaging strategies -- such as including low, but ineffective, levels of the proper active ingredients and applying counterfeit holograms to packaging -- to deceive investigators and consumers. In fact, Fernandez, a bioanalytical chemist, and his collaborators found that some counterfeit artesunate anti-malarial drugs contain up to 10 milligrams of the active ingredient compared to the 50 milligrams that genuine artesunate tablets contain.
We make no apology for the use of the term manslaughter to describe this criminal lethal trade, the authors write. Indeed, some might call it murder. Somewhere people are directing a highly technical and sophisticated criminal trade in the full knowledge that their ineffective product may kill people who would otherwise survive malaria infection.
Serious implications exist for the relatively new practice of incorporating ineffective levels of active ingredients in artesunate tablets, the authors note. Exposure of malaria parasites to low concentrations of artesunate in patients taking counterfeit products will greatly increase the risk for the selection and spread of malaria parasites that are resistant to artemisinin derivatives. That could lead to a loss of effectiveness for these essential medicines and an avoidable failure of malaria control, they write. In addition, the presence of small quantities of artesunate in tablets may mean that the Fast Red dye test, widely used for screening the quality of artesunate tablets, yields false-positive results, depending on how much artesunate is present in the fakes.
Also, many fake artesunate tablets contain other drugs, possibly because the counterfeiters are trying to further deceive patients and doctors by producing a placebo effect, Fernandez said. For example, some of the counterfeit tablets we analyzed contained acetaminophen that would reduce a fever, or the antibiotic erythromycin, or even early-generation anti-malarials that are no longer effective.
The researchers analyses determined there are now at least 12 different types of fake artesunate, classified by
At this point, we believe there are probably multiple sources, but they may be using the same distribution network, Fernandez added.
The authors also cite serious implications of this public health problem for tourists in malaria-prone countries. Visitors often buy unregulated artemisinin derivatives in the tropics or on the Internet. It is inevitable that counterfeit artesunate will seep into this trade, the authors predict.
The greater concern, they note, is for sub-Saharan
The high cost and shortage of ACT provide a favorable situation for the spread of fake artemisinins that could put the lives of thousands of African children at risk, the authors write. They urge authorities to implement tighter controls on drug importation, as well as a subsidy of up to $500 million a year to ensure that ACTs provided through the private sector are relatively inexpensive and locally affordable so there is no financial advantage in unwittingly purchasing a fake.
It will be an avoidable tragedy if a lack of political will and action allows fake artesunate to compromise the hope that artemisinin derivative-based combination therapy offers for malaria control in
Source: Georgia Institute of Technology