Peres Jepchirchir has been provisionally suspended by the Athletics Integrity Unit after an out-of-competition sample tested positive for EPO, the performance-enhancing substance banned across international sport.
The Kenyan marathon runner, who captured the 2026 Sydney Marathon title with a time of 2:18:31, is now at the center of a doping investigation that threatens to derail one of athletics’ most promising careers. The positive result emerged from a pre-race drug test conducted before the Sydney Marathon event.
Investigation Underway
The provisional suspension means Jepchirchir is barred from competing pending the outcome of further investigation by the Athletics Integrity Unit. The organization enforces anti-doping regulations across track and field, and positive EPO tests represent one of the sport’s most serious violations.
The case adds another chapter to ongoing concerns about doping in distance running, a discipline where endurance-enhancing drugs have long posed particular challenges for anti-doping authorities. EPO, or erythropoietin, artificially boosts red blood cell production to increase oxygen-carrying capacity—a significant advantage in the grueling marathon distance.
What Lies Ahead
Jepchirchir’s achievement in Sydney demonstrated elite-level performance at marathon distance, but the positive test now casts a shadow over that accomplishment. The Athletics Integrity Unit will conduct further testing and investigation before determining whether to pursue a full disciplinary case and potential ban.
The suspension affects one of Kenya’s top distance runners at a critical moment in the international athletics calendar, removing a major competitor from upcoming marathon competitions while the investigation proceeds.