3 doctors weighed in:
Why is estrogen combined with progestogen in oral contraceptives?
3 doctors weighed in

Dr. Michael Murray
Fertility Medicine
2 doctors agree
In brief: Minimize spotting
Break-through-bleeding (btb) is common with the progestogen (p) only oral contraceptive pills (ocp).
Although btb can still occur with the combined estrogen (e) and p ocp, it is much less frequent, versus p alone. In ocp with high levels of e, such as ethinyl Estradiol 50 mcg, ovarian cysts and ovulation also occur less frequently. Way to go gregory pincus, et al.

In brief: Minimize spotting
Break-through-bleeding (btb) is common with the progestogen (p) only oral contraceptive pills (ocp).
Although btb can still occur with the combined estrogen (e) and p ocp, it is much less frequent, versus p alone. In ocp with high levels of e, such as ethinyl Estradiol 50 mcg, ovarian cysts and ovulation also occur less frequently. Way to go gregory pincus, et al.
Dr. Michael Murray
Dr. Michael Murray
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