DEADLY dance drug GHB is cheaper and easier to get in Melbourne than anywhere else in Australia, a leading researcher has warned.

Its estimated street value is less than $7 for a 2ml "charge", about the same price paid for two pots of beer.

It's feared the drug, linked to overdoses at city raves in the past six months, is more popular with Melbourne teens because it's so cheap.

Drug and Alcohol Research and Training Australia spokesman Paul Dillon said a worrying trend was emerging.

"There is certainly anecdotal evidence to suggest GHB is more accessible in Melbourne and it's cheaper," he said.

That may explain why there are more GHB-related overdoses than in Sydney, he said.

"In Melbourne, ambulances have been lined up at major dance events . . . you never used to see that."

More than 25 people were treated for suspected GHB overdoses at a weekend party.

Ambulance spokesman Paul Holman said paramedics had saved victims' lives.

"Some of them had to have breathing tubes inserted, just to keep them alive," he said.

In December, 30 people were treated for GHB overdoses at a Festival Hall party.

Mr Dillon said GHB cost so little, he knew of a dealer who flew here to take it to Sydney. Users usually take 2ml "charges" for less than $7, compared with $30 for an ecstasy pill and $180 for a gram for speed.

GHB use was blamed for closing the Kryal Castle rave.

Online users said the latest victims were irresponsible.

One dance music site blogger said GHB was ruining Melbourne's trance music scene.

"I really enjoy going to Melbourne for trance events ... (but) every time I do though, I see way more people f---ed up than I do in Sydney or Brisbane."

Since 2001, GHB, or gammahydroxybutyrate, has been blamed for overdose increases and deaths. Drug agency Turning Point said that from October 2007 to March 2008, 60 per cent of overdoses occurred in Stonnington and Port Phillip.

GHB contains sodium hydroxide, potassium hydroxide and ingredients used in drain cleaners and solvents used to strip floors. It is odourless, almost tasteless, and its effects can be felt within 20 minutes.

About 10 Australians have died after using GHB.

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