Saddam had been due to appear in court again on Monday
Saddam Hussein is thought to have begun refusing food on 7 July in protest at the murder of his lawyer.
He and seven co-defendants are on trial charged with crimes against humanity.
"We took him to hospital and he is being currently fed by a tube," chief prosecutor Jaafar al-Moussawi told the news agency Associated Press.
Asked whether the former leader's health had improved, he replied: "No, it is not stable yet."
Saddam Hussein and three co-defendants are believed to have begun their latest hunger strike more than two weeks ago.
Security woes
They are protesting against procedures at the tribunal, and also demanding better security for defence lawyers.
Three defence lawyers have been murdered during the trial
Three members of the defence team have been murdered during the course of the trial - most recently senior lawyer Khamis al-Obeidi, shot dead in June.
Saddam Hussein, 68, had been due to appear in court again on Monday, but Mr Moussawi told another news agency he would be unable to attend.
However, Mr Moussawi warned Saddam Hussein's lawyers they would be committing an offence if they did not attend.
The prosecution has called for the execution of the former president and two others for the deaths of 148 villagers during a crackdown in the village of Dujail after an assassination attempt in 1982.
Gemäß einer Meldung auf der Internetseite „bbc.co.uk“ vom 23. Juli ist der ehemalige irakische Präsident Saddam Hussein ins Krankenhaus eingeliefert worden. Dort wird er über eine Magensonde künstlich ernährt. Er war vor mehr als zwei Wochen in den Hungerstreik getreten, nachdem einer seiner Anwälte erschossen worden war. 

Der Chef-Ankläger Dschaarar al-Mussawi sagte, dass Saddam Hussein nicht in der Lage sein werde, an der geplanten Anhörung am heutigen Montag teilzunehmen. Diese Befragung ist Teil des Verfahrens gegen Hussein wegen Verbrechen gegen die Menschlichkeit. Der ehemalige irakische Diktator soll für ein Massaker in dem schiitischen Dorf Dudschail im Jahr 1982 verantwortlich sein, bei dem 148 Bewohner getötet wurden. 

Der Prozess, bei dem weitere sieben Personen angeklagt sind, soll notfalls auch ohne ihn weiterlaufen. Drei von ihnen waren gleichzeitig mit Saddam Hussein in den Hungerstreik getreten.