Tariq Aziz, Iraq's former foreign minister under Saddam Hussein, was admitted to hospital last week for a check up after fainting. His health has been confirmed as "normal", and he was sent back to prison on Thursday.
Aziz had been due to face questioning by a judge last Wednesday, but he fainted on Tuesday.
Badie Arif Ezzat, Aziz's lawyer, said that Aziz had fainted repeatedly on Tuesday. In January last year, Ezzat told the BBC that his client had suffered a stroke and had barely a month to live.
The coalition issued a statement:
"All studies came back normal for a person Mr Aziz's age... and [he] is currently in the same health and with the same functional status as he was prior to his fall."