Botha was bronze medallist in the long jump and competed in the heats of the 4x100 metres relay in which South Africa went on to take the silver in the final without her.
"Karen Botha is automatically suspended. She will play no more role in these championships," the African Amateur Athletics Confederation's president, Lamine Diack, said. "She will return the long jump medal to us."
He said he had received a full medical report and the AAAC was now waiting for presentations from the South African delegation.
Botha told a news conference on Saturday she had unknowingly taken the banned substance in back pain medicine prescribed by a doctor. Ismail Jakoet, the South African team doctor said on Saturday Botha had tested positive for the banned substance dextropropoxyphen.Reuse content