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
Thank
Get help from a real doctor now
Dr. Adam Levy
Board Certified, Obstetrics & Gynecology
33 years in practice
1M people helped
Continue
108,000 doctors available
Read more answers from doctors