“…Surveys by the Medical Research Council, the Royal College of General Practitioners and the Committee on Safety of Drugs (MRC communication, 1967) have confirmed that the administration of oestrogen-progesterone combinations do increase the risk of thrombo-embolism. There is no doubt that the administration of oestrogens, in order t o suppress lactation, may carry a significant risk of puerperal thrombo-embolism, particularly in the obese older patient who has had some form of operative delivery (Daniel et al,1967;Jeffcoate et aL, 1968). To the hospital doctor there is no doubt that oestrogen suppression is markedly effective in halting lactation and preventing discomfort from breast engorgement.…”