Jockeys in Ireland who test positive for cocaine will face a five-year ban, the Irish Horseracing Regulatory Board has announced.
The starting point had already been doubled from two to four years, but the IHRB is to adopt an even tougher stance following a recent increase in contraventions of the rules.
Denis Egan, chief executive of the IHRB, said: "The increase in the number of positive tests is very worrying, but racing is probably no different than what is happening elsewhere in society.
"Since 2016 we have had 12 positives for cocaine and five of these came in 2018 from 254 tests, so the problem is getting worse.
"Any rider caught in future can expect a lengthy ban and in many cases such a ban could potentially end a rider's career so they need to be very careful."