Chinese swimming star Sun Yang failed a doping test in May and was subsequently banned for three months, Xinhua news agency reported on Monday.
Sun tested positive for the stimulant trimetazidine in a doping test on May 17 during the national swimming championships, the report said, citing the China Anti-Doping Agency.
The report did not explain why the news was disclosed only now, after the ban on the Olympic athlete has expired.
The announcement has been posted on the website of General Administration of Sport on Monday.
Trimetazidine was added to the World Anti-Doping Agency’s banned list in January this year. The drug is able to increase coronary flow reserve.
Sun defended himself in a July hearing where the experts decided to hand him a three-month ban. He said he used the drug for medical reasons and that he was unaware that it was included in the anti-doping agency’s prohibited list.
The swimmer was fined for 5,000 yuan (US$814) and his 1500-meter championship has also been revoked, according to the report.
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