- Captopril inhibits in vitro and in vivo the proliferation of primitive haematopoietic cells induced into cell cycle by cytotoxic drug administration or irradiation but has no effect on myeloid leukaemia cell proliferation. Chisi, J.E., Briscoe, C.V., Ezan, E., Genet, R., Riches, A.C., Wdzieczak-Bakala, J. Br. J. Haematol. (2000)