Ruti Aga Banned Six Years: Tokyo Marathon Champion Submitted Fake Prescription to Hide Doping Violation

Photo: nakashi / Wikimedia Commons (CC BY 2.0)

The drug test was the beginning of Ruti Aga’s problems, not the end of them. When the 2019 Tokyo Marathon champion tested positive for a banned corticosteroid after winning a half marathon in China in March, the case could have closed relatively quickly. Athletes have beaten similar charges before, with valid medical paperwork and a Therapeutic Use Exemption. Aga chose a different path. She submitted a prescription from a clinic that didn’t exist, signed by a family member who had no medical registration. On Thursday, the Athletics Integrity Unit issued a six-year ban, without ever holding a hearing. She never responded to the charges at all.

What Ruti Aga tested positive for and why it is banned

Methylprednisolone is a glucocorticoid, a class of corticosteroid that has been on WADA’s prohibited list since 2016. It is primarily used as an anti-inflammatory and pain management drug. Athletes often cite it for treating legitimate injuries — knee pain, respiratory issues, inflammation — and it has appeared in a number of marathon doping cases in recent years.

What makes its presence in sport complicated is that the drug’s performance-enhancing effect is genuinely contested. Glucocorticoids can reduce the perception of fatigue and may offer minor benefits to submaximal aerobic endurance. But methylprednisolone does not increase VO2 max or improve high-intensity anaerobic capacity. A clinical review cited by Athletics Illustrated noted that it failed to improve overall exercise capacity even in patients with lung conditions. In other words, it may help an injured athlete train through pain, which is itself a competitive advantage, but it is no EPO.

Athletes with a genuine medical need can apply for a Therapeutic Use Exemption through World Athletics. Had Aga done that, with a real doctor and a real clinic, this case might have looked very different.

How the fake prescription unravelled

Aga’s defence was that a doctor in Ethiopia had prescribed methylprednisolone to treat knee pain. The AIU investigated. Investigators found that the clinic named on the prescription document didn’t exist. The signature on the document belonged to a family member who was not a registered medical professional.

That finding elevated the case from a standard doping violation to a tampering charge under Article 2.5 of World Athletics’ anti-doping rules. Tampering is defined as conduct that subverts the doping control process, and fabricating documentation to explain an adverse analytical finding is a textbook example. Aga then compounded the situation by failing to respond to the notice of charge at all, meaning the AIU issued the ban without a hearing.

Ruti Aga’s marathon career — a record that will now be scrutinised

Before this case, Ruti Aga was one of the most decorated marathon runners of her generation. Born on January 16, 1994, she grew up as a track athlete, winning silver in the 5000 metres at the 2012 World Junior Championships in Barcelona and gold at the African Junior Championships in Bambous in 2013. She transitioned to the roads in 2016 and quickly established herself as a World Marathon Major podium fixture.

She was still racing at a high level into 2026, defending her Xiamen Marathon title in January. The AIU collected the sample that triggered this case in March, just weeks later. Results from the date of the adverse analytical finding will be subject to disqualification, which may affect several recent performances.

Ethiopia’s marathon doping problem is getting harder to ignore

This case does not exist in isolation. Ethiopian distance running has produced some of the greatest marathon performances in history, and the country’s athletes have long dominated the World Marathon Majors alongside Kenya. The physiological and cultural reasons for that dominance are well documented. But the AIU’s case list has accumulated a troubling number of Ethiopian names.

Methylprednisolone specifically has become something of a recurring substance in East African distance running doping cases. In 2025, the AIU banned Kenyan marathon runner Careen Cheptoek for two years after she tested positive for the same substance, with no valid medical explanation provided. Other Ethiopian marathon runners have faced bans under the Athlete Biological Passport programme in recent years. Ronald Kipkoech Korir of Kenya and several other East African distance runners are currently in proceedings with the AIU on ABP-related charges.

The pattern prompts legitimate questions about what is happening within some East African training environments. Whether that is a coaching culture of masking injury pain to maintain training loads, supplement contamination, or deliberate doping is a question the AIU and the respective national athletics federations need to answer more transparently. The Ethiopian Athletics Federation in particular has faced pressure from World Athletics over its anti-doping education and testing infrastructure.

What separates the Aga case from most others is the active document fraud. This was not an athlete caught using a substance and then staying silent. This was an athlete who fabricated medical evidence from a fictitious clinic and had a family member forge a doctor’s signature. The AIU’s investigators caught it. The fact that Aga then chose not to engage with the process at all suggests she understood there was no credible defence to mount.

What happens next for Ruti Aga

A six-year ban, issued from the date of provisional suspension in September 2026, means Aga would not be eligible to compete until 2032. She will be 38. At the elite marathon level, that is effectively a career-ending sanction. There is an appeal route through the Court of Arbitration for Sport, but mounting a credible appeal when the core of the tampering charge, the fake prescription, has already been confirmed by investigators, would require exceptional grounds.

Results from the date of the in-competition test in March 2026 will be disqualified by the AIU. Any prize money from those performances is likely to be returned.