Dudu Topaz attempted to commit suicide overnight Wednesday in his Abu-Kabir prison cell, an Israel Prison Service spokesman said.
A warden found the 62-year-old diabetic actor and entertainer in a dazed condition after having injected large quantities of insulin.
Topaz was taken in fair condition to Holon's Wolfson Medical Center for further treatment.
On Tuesday Topaz confessed to hiring men to assault media executives who rejected his ideas for television programs.
Shira Margalit, deputy director-general of the Reshet television network, Avi Nir, director-general of the Keshet network, and actor's agent Boaz Zion have all been the victims of previously unexplained attacks by groups of men. Police also believe Topaz planned on attacking Amos Regev, editor of the Yisrael Hayom newspaper, who turned down Topaz's idea for a column.