Активното вещество в Siklos, хидроксикарбамид, потиска растежа и възпроизводството на някои клетки, например кръвните клетки.
Although the precise way that it works in this disease is not understood, hydroxycarbamide can reduce the numbers of cells that are circulating in the blood, as well as prevent 7 Westferry Circus, Canary Wharf, London E14 4HB, UK Tel.