West Australian Premier Mark McGowan says personal drug possession won't be decriminalised, after the Australian Medical Association WA called for a debate on addiction being treated as a health, rather than criminal issue.

Mr McGowan said he supported treatment options for prisoners with substance abuse issues, but was not open to a debate on decriminalising any drug offences.

Portugal reformed their drug laws 2001 so drug users are dealt with outside the courts.

"You need to have a mix of solutions, and what we want to have is that mix of education, treatment, as well as the force of law," he told reporters on Sunday.

"What I hate is people going into prison, coming out worse than when they went in