Physical and verbal assaults on NSW paramedics have trebled, with most offenders drunk or on drugs.

There have been 50 assaults on paramedics so far this year, up from 16 over the same period in 2012, according to NSW Ambulance Service figures.

Most of this year's incidents involved members of the public who were intoxicated or drug-affected, NSW Ambulance chief executive Ray Creen said.

Paramedics weren't "punching bags", he said.

NSW Health Minister Jillian Skinner said any attack on a paramedic was a "disgraceful act".

"That these dedicated paramedics should be harassed, threatened or harmed beggars belief," she said.

She urged paramedics to report attacks.

Anyone found to have committed an act of violence against a paramedic can face up to five years behind bars.