Efexor is a drug used to prevent and treat a relapse of depression.
As yet, there is no clinical proof linking gambling addiction to Efexor.
However, two weeks ago, Leanne Scott revealed to the ABC's 7.30 program that she was using the drug not long before she began committing fraud to feed her 'pathological' addiction to poker machines.
"I started the drug Efexor in late 2003 ... and it was in 2004 that the stealing started." Scott told the program.
"I really had an 'I don't care attitude' ... like I knew what I was doing was wrong but I don't care."
"I'm actually (undergoing) therapy at Statewide Gambling therapy service, and my counsellor says she is actually seeing a lot of people who are taking Efexor.
Scott has since been sentenced to two years' jail for fraud.
Now, more gambling addicts have come forward to reveal they too were using Efexor while their addictions raged.
Tim Hillier has a Bachelor of Business, a Masters in Applied Finance and has worked as an investment banker.
He was prescribed Efexor to treat an obsessive compulsive disorder and depression.
Almost immediately, he started gambling.
"Initially I was betting on the horses, but I was betting on the casino and betting about $100 a horse race, up to $500," Mr Hiller told 7.30.
"That was for the first couple of weeks, and when I moved over to AFL sports betting I bet up to $1000 on a game of football, maybe 4, 5, 6 bets around $1000, and then gradually (that) increased with a couple of losing bets, and went up to a $5000 bet."
"Eventually I made an $80,000 bet on a game of tennis."
Yet he says under the drug Efexor, the emotional impact of such an astonishing loss was minimal.
"I thought I'd feel upset but because of the medication I was on, and the blunting effect that it had on me, I didn't feel much at all. I actually went to sleep and got up the next day and was fairly normal."
Within three months, Tim Hillier was financially ruined.
However, a prominent psychiatrist has told the ABC's 7.30 program that does not mean the problem is not real.
Professor Jayashri Kulkarni is the Director of Psychiatric Research at Melbourne's Alfred Hospital.
"I was very interested to hear about the link between gambling and the use of Efexor," Professor Kulkarni said.
"I think here we could have a link in the neurochemical sense between the use of a medication that increases two neurochemicals seratonin and noradrenalin and the development of new problem gambling behaviours."
Professor Kulkarni says the drug is widely used and says it is "a very good anti-depressant".
But says it warrants further scrutiny.
"What we really have to be careful about is using the drug wisely, using it in carefully diagnosed depression and then we have to be extremely vigilant about follow-up."
The Salvation Army also wants further scrutiny into the drug.
The organisation's Maria Turnbull wants to survey gambling addicts across the country to gather more data on its impact.
"I really hate to think how widespread it could be," she said.
"I'm aware of eight cases where people have presented ... taking Efexor and having gambling as an issue, just in Victoria."
While there has been no clinical study linking Efexor to problem gambling, other similar medications have been connected.
Drugs used to treat Parkinson's disease are now the subject of a class action after evidence linking Permax and Cabaser to gambling addiction and hypersexuality in some patients - exactly the same side-effects as those now being described by Efexor users.
But nowhere in Efexor's six page fact sheet listing usage and side-effects does the word 'gambling' appear.
Efexor is marketed in Australia by Pfizer.
Tim Hillier and another Efexor user phoned Pfizer to complain.
"They admitted to us there is a small percentage of people who may have these compulsive behaviours like gambling and there are these other issues, but from their point of view it's a such a small percentage that it's not worthy of a warning," he said.
Mr Hillier says he hasn't gambled since he stopped taking the drug.
"There needs to be a lot more discussion and a lot more awareness, because people take these medications and particularly psychiatric type of medications and they don't discuss them," he said.
"They're embarrassed or whatever it might be, so they take powerful medications in secret.
"It's just not a good thing."
In a statement, Pfizer said it takes medicine safety very seriously, but it did not answer specific questions 7.30 posed to it about Efexor.