Dutch news agency APN said that the International Criminal Tribunal for the former Yugoslavia (ICTY) in The Hague had asked Uges, a toxicologist from the University of Groningen, late last year to run the necessary tests to find out why Milosevic's blood pressure remained high despite the use of the prescribed medicines.
"He took a drug containing rifampicin, which negates the effect of high blood pressure treatment," Uges said, adding that rifampicin was used to treat leprosy and tuberculosis.
"He took it by himself because he wanted a one-way ticket to Moscow," Uges said as quoted by French news agency AFP.
Milosevic asked the ICTY in December to transfer him to Moscow for medical treatment, but the judges rejected his request believing that he was receiving sufficient care in The Hague and fearing that he would not return for the trial.