The use of crack cocaine is up 600 per cent since 2016.
But powder cocaine remains the most common drug people are seeking treatment for.
Opioids and cannabis were the second and third according to the Health Research Board.
Over 12-thousand people were treated for problem drug use last year. 40 per cent of those who accessed treatment had children living with them.
Dr. Anne Marie Carew is with the Health Research Board.
She said: ''We have seen a rise in figures for crack cocaine although it is far less than powder cocaine. The number of cases treated for crack cocaine has been rising. It accounted for 22 per cent of all cocaine treatment last year.''