Schapelle Corby collapsed in a drowsy drug stupor two months ago, in what is understood to be a deliberate overdose.

7News reports Corby's collapse occurred days before her 34th birthday in July, when she is said to have spent two days on her cell floor because her fellow inmates were too afraid to notify anyone.

Corby consumed a week's worth of her own prescription anti-psychotic drugs which are meant to be guarded and administered by a trusted cellmate, reports 7News.

According to other reports, the drugs consumed made her excessively drowsy and she was not taken to hospital.

In an interview conducted with 7News early this week, Schapelle's sister Mercedes addressed the drug collapse saying that her family was not notified immediately, saying there was nothing they could do to help Schapelle.

"She was quite bad, but once we found out and we gave her the medication, she stabilised quite quickly and she's doing ok now." said Mercedes when asked about how severe the overdose was.

Mercedes denies the drug overdose was an attempted suicide, "I don't know. Schapelle's mentally unstable. I don't know what it was." says Mercedes.

When asked how unstable, "Well, she's on anti-psychotic medication that usually keeps her stable but if she doesn't take them, it's quite bad." admits Mercedes.

News of the overdose was released by a group working to free Schapelle Corby called The Expendable Project.

In August 2011 Schapelle's sentence was cut by five months to coincide with Indonesia's Independence Celebrations. Her sentence was reduced by a similar amount a year prior. She has 11 years left to serve in prison.

Two-years ago Schapelle Corby was diagnosed as depressed and psychotic.

In 2008 it was reported that Corby had been admitted into Bali's Sanglah hospital to be treated for depression.

Doctors reportedly said Corby experienced hallucinations and was being treated with anti-depressants and other medications.

Readers seeking support and information about suicide prevention can contact Lifeline on 13 11 14 or Kids Helpline 1800 55 1800.

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