Paramedics were called to a Gold Coast high school three times in one day after four girls became ill from an unknown prescription drug.
It's not known if the Southport State High School girls took the drug together or at different times throughout the day.
The first call to Queensland Ambulance Service was at 8.30am on Friday when one girl fell ill.
By 12.15 pm paramedics had returned to the school after two other girls became sick.
The final call came at 1.30 pm when the fourth girl fell ill, a Queensland Ambulance Service spokesman said.
All four girls in their mid teens were taken to Gold Coast University Hospital in a stable condition.
One girl has since been released.
A school-based police officer attended the scene but no investigation has commenced into the incident, a police spokesman told AAP.
Southport State High School has been contacted for comment.
