Former president, Jacob Zuma, has been admitted to an outside hospital for medical observation.
The Department of Correctional Services said the move was prompted by a routine observation.
Zuma is currently serving a 15-month prison sentence in the Estcourt prison in KwaZulu-Natal.
He was found guilty of contempt of court.
The 79-year-old is due to appear in person in court next week when his corruption trial resumes.
He faces several charges related to the 1999 arms deal.