[Clinical trial of a combined oral contraceptive with low estrogen dose (author's transl)].

309 women took a combined oral contraceptive (0.04 mg ethinylestradiol and 2.0 mg lynestrol) in 1876 cycles under clinical supervision. The preparation was extremely well tolerated. Pregnancy did not occur; In 57 cases the administration of the tablets was concluded prematurely, but side effects were given as the reason for this discontinuation of the contraceptive in only 6.5% of the cases. Withdrawal bleeding lasted 3.9 days in the control cycle and 3.7 days in the 6th treatment cycle. Breakthrough bleeding occurred in 0.3% of the women.