An 18-year-old man is facing charges after allegedly assaulting a NSW Ambulance Paramedic in New Lambton last night.

About 9.30pm (Monday 26 January 2015), police were called to a loud party on Bridges Road.

The man was allegedly observed to be well-affected by alcohol or drugs and became aggressive and abusive towards police.

Due to his level of intoxication and behaviour he was arrested and an ambulance was called to convey the man to hospital for assessment.

Police will allege that whilst in the ambulance, the man remained violent and abusive and spat on a female Paramedic as she was trying to treat him.

The driver of the ambulance immediately stopped and the escorting police were forced to restrain the man again, before he was taken to hospital.

The NSW Ambulance Paramedics were not injured during the incident.

Due to his level of intoxication, the man will be issued with a future court attendance notice for offensive behaviour, common assault and assaulting an ambulance officer