Cork South West TD Christy O'Sullivan (Fianna Fáil) has been disqualified from driving for one year and fined €300 after he pleaded guilty to drink-driving.
Deputy O'Sullivan was over the limit by eight milligrams of alcohol when he was stopped at a Garda checkpoint in Clonakilty on the evening of June Bank Holiday Monday.
Mr O'Sullivan was arrested on suspicion of drink-driving after he failed a roadside breath test.
A subsequent blood sample taken at Clonakilty Garda station gave a reading of 88mgs of alcohol to 100ml of blood.
Superintendent Pat Maher told the court that the Fianna Fáil TD contacted him the following day to apologise.
The court also heard that he was extremely embarrassed by what happened and that a disqualification would inconvenience him in his constituency work.
Judge James McNulty imposed a one-year driving ban and a fine of €300 with costs of €100 to cover the blood analysis.
The disqualification will take effect from January 1.