The mother of a teenager who died after taking drugs at the FOMO music festival has emotionally recounted one of her last conversations with her daughter.

Key points: The inquest findings will be delivered urgently ahead of this summer's festival season

The inquest findings will be delivered urgently ahead of this summer's festival season It's been examining six overdose deaths between September 2018 and January 2019

It's been examining six overdose deaths between September 2018 and January 2019 The victims' parents want the Government to act urgently when recommendations are handed down

An inquest into the deaths of Diana Nguyen, Joseph Nguyen Binh Pham, Callum Brosnan, Joshua Tam and Alex Ross-King finished today, after three weeks of public hearings.

All six died between September 2018 and January 2019 after taking drugs at music festivals.

Deputy state coroner Harriet Grahame told the court she would deliver her findings urgently, on November 8, before the summer festival season kicks off.

Jennie Ross-King, mother of 19-year-old Alex, told the court she had talked to her daughter about drug taking before she attended the festival.

"[I said] 'Honey, Alex look at me, I worry, look I just want you to be safe'," Ms Ross-King recalled.

"'I'm not saying you're going to do anything but kids are dying'.

"[Alex replied] 'Mum it's OK, I'm not stupid'. She smiled and continued to get ready."

Ms Ross-King said she'd be forever grateful the last thing they said to each other was "I love you".

Shared grief: The parents of the overdose victims are pushing for change. ( ABC News: Kathleen Calderwood )

She then recounted receiving numerous phone calls on the day of the festival — initially from her daughter's friend saying they were taking Alex to the medical tent and eventually from a doctor saying she was in cardiac arrest and that they "were doing everything they possibly could".

"[When I got to the hospital] what I saw was what no parent ever wants to see … they were working so furiously to save her … I just wanted to get close and whisper to her that I was there," Ms Ross-King told the court.

"Whilst visibly upset they told me they couldn't do anything for her.

"Then I spent the next hour and a half with her talking to her, watching her sleep … that was the last memory I have of her. Please don't let that be the memory of another parent."

The coroner, who was visibly upset, thanked the parents for their contribution.

"The generosity you have shown, engaging with this process and sharing such private feelings, I respect it so greatly," Magistrate Grahame said.

Outside court, six parents spoke to the media and called for the Government to act urgently on the coroner's recommendations when they are handed down.

"Our children's faces must be the faces of change — their deaths must ignite an increase in harm minimisation methods and change in approach to what must be done," John Tam, father of Joshua Tam, said.