A Sydney doctor has proposed drug testing facilities be installed at music festivals so revellers can know exactly what they are ingesting.

Dr Alex Wodak, president of the Australian Drug Law Reform Foundation and director of the Alcohol and Drug Service at Sydney's St Vincent's Hospital, has spoken out after 25-year-old Sylvia Choi died at Sydney’s Stereosonic music festival on Sunday.

There were reports it took her friends 10 minutes to get to the medical tent. By the time she finally arrived at hospital, the promising young Sydney pharmacist was dead.

Promising young Sydney pharmacist Sylvia Choi, 25, died after ingesting a deadly drug cocktail at Stereosonic music festival in Sydney on Saturday (Source: A Current Affair)

Five lives have been lost due to drugs at New South Wales music festivals over the past 12-months and Dr Wodak said something needs to change soon.

"How many more deaths are we going to have to have before we start doing what we should be doing all along and talking about better ways of preventing this?" Dr Wodak asked.

"By that, I mean testing the drugs, on-site or off-site, testing to see whether the drugs are what the seller claimed they were, testing to see whether they have toxic adulterants in them, testing to see what the dose of the drug is per tablet," he told A Current Affair .

The last time Jennifer Janson spoke to her 19-year-old son Martin, he was living the dream on a working holiday visa in Canada.

But just three days after their last Skype chat, Nathan died after ingesting a deadly cocktail of drugs.

Jennifer Janson runs drug awareness seminars after her son, Nathan, died after taking drugs in Canada (Source: A Current Affair)

Despite running drug awareness seminars for young people, Mrs Janson admits her "Just Say No" message is a hard sell.

She supports Dr Wodak's drug testing plans.

"If it is going to keep young people, or people, safe it possibly is a good thing," Mrs Janson said.

Opening the newspaper to the news of Miss Choi’s death, Mrs Janson was left dumbfounded.

"You can't make sense of it all, it is totally useless," she said.