Charles Kipkkurui Langat, a 29-year-old Kenyan road runner, has been banned from the sport for five years for doping.
He had submitted an out-of-competition urine sample in Iten, Kenya and tested negative in July 2024; however, upon further analysis in October, the sample tested positive for furosemide. Kipkurri was first given a two-year suspension.
In July 2025, again upon further analysis, the sample returned a positive result for testosterone and its metabolites androsterone, 5α-androstane-3α,17 diol (“5αAdiol”) and 5β-androstane.
Furosemide is a diuretic and a masking agent.
Recently, several Kenyan athletes have tested positive for a diuretic and masking agent, including world marathon record holder Ruth Chepngetich.
Langat has raced the half-marathon as fast as 58:53 during the Barcelona event in February 2023. In January 2023, Langat ran the Valencia 10K in a time of 26:57, which represents his personal bests.
They will have to get better at masking the masking agent if they are going to attempt to try to get away with doping, as approximately 400 other Kenyans have proven over the past decade.
