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How do the hormonal compounds in birth control pills, such as Yasmin, Yaz, Diane-35 and ECPs, work at preventing pregnancy?

Age: 16 - 29
Sexual Health Women's Health Medication & Prescriptions
DOCTOR’S ANSWER (1)
Dr Christopher Ng
"More than 20 years of obstetrics and gynaecology experience"
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First and foremost, all these oral hormonal contraceptives principally work by preventing ovulation (the release of an egg from the ovary).

In this way, their primary mode of action is to prevent fertilization of the egg and sperm. In addition to this, they also thicken the cervical mucus which in turns makes it hostile for sperm survival and reduce the ability of motile sperm to "swim" into the uterine cavity and Fallopian tubes.

Lastly, they also decrease the thickness of the endometrium (uterine lining) thereby impairing the implantation of the embryo. This is why these hormonal contraceptives are very effective.


Dr Christopher Ng

GynaeMD Women's & Rejuvenation Clinic

#04-03A Camden Medical Centre
1 Orchard Boulevard
Singapore 248649


94 views 7 Oct 2019
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