A boy who drank pure methanol and fell "extremely ill" was rushed to the Queensland Children's Hospital overnight.

The boy, described as primary-school aged, drank more than 30 millilitres of pure methanol and was flown from Emerald in central Queensland to Brisbane by a LifeFlight Air Ambulance.

He was loaded into the aircraft about midnight and escorted to Brisbane by a critical care nurse and a specialist paediatric team from the hospital.

The jet landed in Brisbane about 3.30am and the boy was transferred to hospital by ambulance.

Children's Health Queensland said the boy was in a stable condition on Tuesday morning.

Methanol can be used to fuel engines, camping stoves and is a byproduct of home-brewed alcohol.