The Victorian Civil and Administrative Tribunal has handed lengthy cobalt bans to father-and-daughter training partners Terry and Karina O'Sullivan.

The Stawell-based trainers appealed their original one-year sentence handed out by the Racing Appeals and Disciplinary Board and on Wednesday had those disqualifications increased by VCAT, with Terry out for three years and Karina five.

The O'Sullivans faced elevated cobalt charges from Darragh and Gold A Plenty in pre-race samples in 2015 and 2016.

Terry O'Sullivan received a three-year disqualification on each charge with VCAT ruling the penalties be served concurrently.

Karina O'Sullivan was also disqualified for three years on each charge, but her penalties are to be served partly concurrently.

They start their disqualifications on April 16, however they are not permitted to start a horse in the meantime.

The O'Sullivans and Racing Victoria can appeal the VCAT ruling.