Queensland MP Rob Pyne has revealed he was a user of medicinal cannabis to treat muscle spasms before he entered State Parliament in 2015.

The independent MP for Cairns is Australia's first quadriplegic MP and said he used cannabis before it became legal for Queensland doctors to prescribe.

Mr Pyne switched to a pharmaceutical alternative because of his position as a MP.

He said now that medicinal cannabis was able to be prescribed by doctors, he would consider switching his treatment back if he found the right product.

"I'm very busy and it would be very hard to do your job if you were stoned," he said.

"[If you could] get medical marijuana with the THC removed so that controls spasms and allows to work without any impairment, certainly if a product like that were to be available, I'd consider it.

"In controlling muscle spasms — there are other drugs to do that, but every now and then you read the fine print and see that these drugs can have carcinogenic effects and you do worry."

New regulations allowing access to cannabis came into effect in March, giving certain specialists such as oncologists, paediatric neurologists and palliative care specialists the right to prescribe medicinal cannabis.

Four Queenslanders were prescribed the drug in the first four weeks of the laws coming into effect.

Call for amnesty for medicinal cannabis users

The issue was one of the reasons Sunshine Coast MP Steve Dickson gave when he defected from the LNP to One Nation.

Mr Dickson introduced a bill to Queensland Parliament to try to fast-track access to the drug, saying progress was too slow.

He also believed there should be an amnesty in place for medicinal cannabis users in Queensland.

Mr Pyne supports the bill and said he thought easier access to the drug would have benefits beyond the health system.

"Most of the damage being done by drugs in Cairns is being done by ice, synthetic marijuana, chemically enhanced drugs," Mr Pyne said.

"People could have access to an organic product that would lead to health benefits for those who need it for medical reasons, but would lead to less problems around illicit drugs as well."

Earlier this year, the Australian Medical Association of Queensland (AMAQ) said it was likely some GPs would refuse to dispense medicinal cannabis.

While supporters of medicinal cannabis said it improved quality of life, AMAQ president Dr Chris Zappala said there was not enough clinical evidence about its long-term impacts.