A teen who died from a drug overdose at a Sydney dance party has been described as a "good kid" who succumbed to peer pressure.

The 19-year-old Sydney man collapsed at the festival in Sydney Olympic Park in Homebush on Saturday before being taken to hospital in a critical condition, where he later died.



He has been named as Tolga Toksoz.

Mr Toksoz's father told 9NEWS he didn't know his son was going to the rave party.

He described his son as a good young kid who got into a situation where he was pressured by his peers.

He was at the party with his brother, Mehmet.

Party-goers at the dance festival may have been playing a game to see how much of the drug MDMA they could take.

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South Western Metropolitan Regional Commander, Assistant Commissioner Frank Mennilli said it was yet to be confirmed but he believed some drug-affected party-goers had taken a number of pills as a "game" to see how many they could take.

It is not known if the young man who died had participated in the game.

Dutch music producer Armin Van Buuren playing at A State of Trance on Saturday. (Twitter) (A State of Trance Twitter)

A 20-year-old Arncliffe man also at the event was taken to Westmead Hospital and remains in a critical but stable condition on life support.

Four other men were also taken to hospital and police believe all of them had taken illicit drugs.

Assistant Commissioner Mennilli said police had arrested 40 people on charges of drug possession and supply.

"They were dealers that were there preying on the people that go in there and are silly enough to actually go and buy the drugs from them.

"New South Wales Police will continue to use drug dogs and search people at events if we believe they are carrying illegal drugs. If you carry and supply illegal drugs you will be arrested.

"If I had more police there I would have arrested more people."

Assistant Commissioner Mennilli has expressed his frustration that people continue to use illicit drugs as recreation.

"These people were gambling with their life, it's absolute stupidity," he said.

"I just think they're sick of living.

"I want to make it quite clear. There is no such thing as recreational drugs. Illicit drugs are unlawful and they have been outlawed for specific reasons. They are dangerous and destroy lives."

Among those arrested was a 20-year-old Auburn man who was detained after he allegedly tried to run from police.

He was searched and was allegedly found to be in possession of nearly 100 tablets, believed to be MDMA, and cash.

He was charged with several offences including supply more than an indictable quantity of drugs and deal with proceeds of crime. He was granted bail to appear at Liverpool Local Court on 24 February 2015.

Another man was arrested and allegedly found to be in possession of 130 pills.

Tickets retailed for up to $154 according to the festival's Facebook page.

The festival markets itself as a "celebration weekend" and is spearheaded by Dutch music producer Armin van Buuren, who hosts a weekly radio show in Europe of the same title.