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When does the contraceptive pill start to be effective?

By Júlia Roig Navarro M.D. (gynecologist).
Last Update: 04/26/2022

If started on the first day of menstrual bleeding, the contraceptive pill is effective from that very moment. This is because follicular growth and ovulation will not occur and the endometrium will not be receptive.

Imagen: onset-of-contraceptive-pill-effectiveness

It must be taken every day at the same time and, if taken correctly, it is more than 99% effective.

Many women forget to take it during the first months, which is why some professionals recommend the additional use of a condom. In this way, in addition to avoiding pregnancy, we will reduce the risk of contracting sexually transmitted diseases.

 Júlia Roig Navarro
Júlia Roig Navarro
M.D.
Gynecologist
Dr. Júlia Roig has a degree in Medicine and General Surgery from the University of Barcelona (UB). In addition, she is a specialist in Gynecology and Obstetrics at the Hospital Universitari Arnau de Vilanova and has a Master in Human Assisted Reproduction from the Complutense University of Madrid and did an internship at the Quirón Dexeus center in Barcelona.
Member number: 56030
Gynecologist. Dr. Júlia Roig has a degree in Medicine and General Surgery from the University of Barcelona (UB). In addition, she is a specialist in Gynecology and Obstetrics at the Hospital Universitari Arnau de Vilanova and has a Master in Human Assisted Reproduction from the Complutense University of Madrid and did an internship at the Quirón Dexeus center in Barcelona. Member number: 56030.