BBC: Adrian McCarthy said he was depressed during lockdown and took the drug four or five times while drinking in a pub a day or two before the fixture.
The 42-year-old had his riding licence withdrawn for six months by an independent disciplinary panel.
Panel chairman James O’Mahony said the use of cocaine by riders was “pernicious” for the sport.
In another case heard on Thursday, jockey Finley Marsh, 22, also had his licence withdrawn for six months.
He admitted evading anti-doping testers after taking cocaine, calling it “a mistake that broke me for a very long time”. more