One person is in a critical condition after a vehicle crashed into a pharmacy in Kogarah in Sydney's south, paramedics say.

Emergency service workers were trying to free a patient who was trapped under the vehicle after it crashed into the pharmacy on Railway Parade just before 11.30am.

A NSW Ambulance spokesman said paramedics were assessing several people at the scene. One person was critically injured and was trapped, he said.

He was unable to confirm reports that the critically injured person was a child.

A NSW Police spokeswoman said officers were at the scene, near the intersection with Montgomery Street. However she said the circumstances of the crash were not immediately known.

The pharmacy, O'Reilly and Daly Chemist, is on a corner and is directly across from Kogarah Railway Station. A white four-wheel-drive could be seen wedged in the front of the shop.

More to come