The state government has delivered on a key election promise to halve the threshold required to charge people with manufacturing or supplying large commercial quantities of methylamphetamine or ice, from one kilogram to 500 grams.

Under the Drug Misuse and Trafficking Act 1985 all amphetamines, including ice, are prohibited. Charges of manufacture and supply of these drugs carry terms of up to life imprisonment.

The changes came into effect on Tuesday. Now anyone found manufacturing or in possession for the purposes of supply of a quantity of ice of or more than 500 grams would be charged with an offence which carried a maximum penalty of life imprisonment, rather than the 20 years previously available.

Mr Humphries was pleased to see the crack down on dealers and now wanted to see a greater focus on rolling out treatment services for those already suffering from ice addition.

"We're cracking down on dealers and increasing mobile drug testing to reduce the amount of ice in our communities but the next step is to increase rehabilitation services for sufferers," Mr Humphries said.

"It's time we stopped the spread of ice and worked on reversing the horrible effect it's had on parts of our electorate."

Assistant Minister for Health Pru Goward said the government recognised the need to focus on earlier detection and expanding treatment services for people trying to get clean from this life-destroying drug before addiction took hold.

"Our $11 million investment will deliver more targeted services that keep people off ice and out of emergency rooms," she said.