Hit-and-run driver Puneet Puneet has been hospitalised after taking poison and was mentally unfit to face further extradition hearings, his lawyers have told a Delhi court.

Hit-run driver Puneet Puneet, who fled to India to avoid being sentenced in Australia, is in hospital after taking poison and is mentally unfit to face further extradition hearings, his lawyers have told a Delhi court.

Puneet was a 19-year-old learner driver when he ran into and killed Queensland student Dean Hofstee and seriously injured Clancy Coker in Melbourne in 2008 before fleeing to India in 2009 using a friend's passport.

Puneet Puneet, foreground, is escorted by policemen at a district court in Rajpura, in northern India, in August last year. Credit:AP

"My client is suffering from serious medical conditions and consumed poison last night. He is suffering from mental illness", said Khaniya Kumar Singhal on Friday.