Oral contraceptives containing oestrogens.

abortion is less than that found at full-term delivery, and hence the risk of sensitization associated with abortion should also be less.-ED., B.M.7. Oral Contraceptives ContainingOestrogens SIR,-A preliminary communication from the Committee on Safety of Drugs has just been sent to all doctors in the United Kingdom.The text is as follows:" Approximately half the oral contraceptives prescribed in the United Kingdom contain 75 yg.or more of oestrogen in the form of either mes- tranol or ethinyloestradiol; the remainder con- tain only 50 fg." Reports of suspected adverse reactions received by the Committee on Safety of Drugs now provide evidence that the incidence of thromboembolism is higher among women taking preparations containing larger doses of oestrogen than among those taking preparations containing the smaller dose." The Committee has no evidence that oral