UPDATE: The mystery drug responsible for leaving seven Gold Coast teenagers in hospital has been identified as Phenibut, a nervous system depressant used largely in Russia and eastern Europe.
The drug, which was prohibited in Australia on February 1 following an interim ruling from the Therapeutic Goods Administration (TGA), was confirmed to be responsible for the mass overdose in Senate Estimates on Monday.
Australian Border Force confirmed the substance had been identified by Queensland Police.
Six of the seven teenage boys who overdosed on a powdered drug while at school have been discharged from hospital.
On Thursday, Saint Stephen's College headmaster Dr Jamie Dorrington said two of the boys had been discharged from Gold Coast University. A third was released overnight.
Three of the other boys, aged between 14 and 15, were then discharged on Friday, Gold Coast Health said.
The Year 10 students were hospitalised on Wednesday afternoon after taking the drug and reporting to their school's health centre.
On Thursday, Queensland Police said it was still not know how much of the powdered drug had been ingested by the students or where the drugs were procured.
Media reports of Snapchat footage filmed by the students while they took the drugs have yet to be substantiated, and police have so far found no existence of the video.
Queensland Police is asking anyone with further information to come forward.