2 doctors weighed in:

Birth control pills question. How long it will take to be effective? What is the proper dosage and how many packs do I need for my gf.

2 doctors weighed in
Dr. Gayane Ambartsumyan
Fertility Medicine
1 doctor agrees

In brief: 1 week

If taken correctly and started at the right time, birth control pills will be effective after 1 week of use, but i usually tell patients 2 weeks to be safe.
You will need 1 pack for each month.

In brief: 1 week

If taken correctly and started at the right time, birth control pills will be effective after 1 week of use, but i usually tell patients 2 weeks to be safe.
You will need 1 pack for each month.
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