The 84-year-old Nobel Peace Prize winner is expected to remain in the hospital for a week or two, said the statement issued by the foundation today.
Tutu underwent similar treatment last year, when he was hospitalised several times.
Updated information will be released when it is available, said the archbishop's daughter, Thandeka Tutu-Gxashe.
Tutu became the first black archbishop of Cape Town where he was an outspoken opponent of South Africa's apartheid regime, which enforced a harsh system of racial discrimination. Tutu was awarded the Nobel Peace Prize in 1984.