Medical sources told Mediafax the former premier was neck-wounded by a 9 mm pistol.
The sources said Nastase has shot himself when police arrived at his home to arrest him.
Current Prime Minister Victor Ponta, who arrived at the hospital soon after the ambulance carrying Nastase, said the doctors “have the situation under control.”
Adrian Nastase has been sentenced to two years in prison by the High Court of Justice on charges of corruption in raising funds for his 2004 presidential election campaign.
On January 30, 2012, Nastase had been sentenced to two years in prison by a panel of three judges. A new panel of five judges retried the case and changed Nastase’s charge, but sentenced him again to two years in prison.
The new ruling is final.