Police are investigating after a female paramedic was allegedly assaulted by a drunk woman at a popular Brisbane pub.

Ambulance officers were called to the Regatta Hotel in Toowong on Sunday evening to treat a 19-year-old woman who was found unconscious in the bathroom.

The teenager was reportedly heavily intoxicated and unable to stand, and was treated by a male and female paramedic

When she was taken to the ambulance she allegedly lashed out at the female paramedic, punching her in the face several times.

The 41-year-old paramedic was taken to the Mater Private Hospital in a stable condition with bruising to her face and lacerations to her arms and later discharged.

The patient was taken Royal Brisbane and Women's Hospital.