Australian actress Kym Valentine is suing the producers of soap opera Neighbours.

The star played Libby Kennedy from 1994 until 2004, but took time out of the show to raise her daughter.

She returned in 2007, but took indefinite leave in 2011, just months after she checked into a private hospital to be treated for exhaustion.

Valentine has now taken legal action, accusing production company FremantleMedia Australia, legal director Steven Rosser and former Neighbours producers Susan Bower and Neal Kingston of engaging in unlawful discrimination.

The 36 year old claims FremantleMedia failed to provide "a working environment that was safe" and that it breached "the relationship of trust and confidence".

Valentine is seeking compensation for lost wages and "pain, hurt, suffering and humiliation", as well as an apology and an acknowledgement that she suffered unlawful discrimination, according to documents obtained by Fairfax Media. The actress also wants to be rehired in the role of Kennedy.

A spokesperson for FremantleMedia states, "We don't comment on matters before the courts."