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The 2015 world champion in 110 meters hurdles tested positive for “a low concentration” of a diuretic called acetazolamide in December.

The most common drug we prescribe is the diuretic acetazolamide, which is used to stave off altitude sickness.

Zeng, who also represented the United States at the 2016 Rio de Janeiro Olympics, tested positive for the banned diuretic and masking agent acetazolamide in an out-of-competition test on Oct.

He tested positive for the masking agent acetazolamide in an out-of-competition doping test on the day of his arrival.

Others include: acetazolamide, which is used to treat glaucoma and epilepsy; the antibiotic doxycycline monohydrate; and the blood pressure medicine fosinopril.