Troubled actor Matthew Newton has been arrested and charged in the United States after allegedly resisting police and trespassing on property in Miami.

Newton's lawyer, Chris Murphy, confirmed the arrest on Twitter, saying the troubled actor was in Miami to attend arranged appointments with medical experts.

Mr Murphy says Newton was dining with an Australian when he was arrested for an alleged minor misdemeanour.

He says four witnesses say Newton was not under the influence of drugs or alcohol.

"Matthew Newton charged and released for returning to seating area after being warned to leave. Non-violent resist alleged," Mr Murphy said on Twitter.

"Witnesses including owner confirm no alcohol or drugs. Newton asked for police blood test to confirm."

The arrest comes just weeks after Mr Murphy failed in a bid to have an Australian assault charge against the actor dealt with under the Mental Health Act.

Newton is charged with assaulting a Sydney taxi driver in December last year.

Mr Murphy has previously said that Newton had moved to a "peaceful mid-western community" in America to escape from the media glare at home.

Newton is the son of show business couple Bert and Patti Newton.