Aurillac: Russian Alexandr Kolobnev was withdrawn from the Tour de France by his Katusha team after testing positive for a banned substance.
The International Cycling Union (UCI) said a urine sample the 30-year-old Kolobnev provided on July 6 was found to contain traces of Hydrochlorothiazide.
The Russian is the first rider to fail a doping test during this year`s Tour which started on July 2.
"Earlier today, the UCI advised the Russian rider Alexandr Kolobnev of an Adverse Analytical Finding (presence of Hydrochlorothiazide based on the report from the WADA accredited laboratory in Chatenay-Malabry) in the urine sample collected from him at an in competition test at the Tour de France on 6 July 2011," the UCI said in a statement.
Hydrochlorothiazide, often used in the treatment of hypertension and congestive heart failure, removes excess fluid from the body and reduces urine output.
Kolobnev has four days to request an analysis of his B sample but the Katusha team moved swiftly to end the Russian`s Tour.
"We have decided with the agreement of the rider that he will be no longer with us on the Tour," Katusha sporting director Sergei Kunitchev told reporters.
Kolobnev was lying 69th in the overall standings, 22 minutes and 15 seconds behind leader Thomas Voeckler.