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How Long Do Contraceptive Pills Work?

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Posted on Tue, 12 Apr 2016
Question: Hi my girlfried took morning after pill 2 days ago. And i would like to know how many days it is safe to have unprotected sex?.
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Answered by Dr. V. N. S. Parinam (2 hours later)
Brief Answer:
Probably 48 to 72 hours

Detailed Answer:
Hi,

Generally morning after pills are safe and continue to prevent pregnancies till the effective concentration of the active ingredients are there in the blood. After that the pill would not prevent pregnancy.
These pills are different with different concentrations, NEXT differs from PLAN B and PLAN B PLUS in the concentrations of Levonorgesterol(the synthetic Progesterone)
I would vouch on it till 72 hours of unprotected sex after taking the pill and not more than that.
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Above answer was peer-reviewed by : Dr. Yogesh D
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Answered by
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Dr. V. N. S. Parinam

General & Family Physician

Practicing since :2008

Answered : 1727 Questions

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How Long Do Contraceptive Pills Work?

Brief Answer: Probably 48 to 72 hours Detailed Answer: Hi, Generally morning after pills are safe and continue to prevent pregnancies till the effective concentration of the active ingredients are there in the blood. After that the pill would not prevent pregnancy. These pills are different with different concentrations, NEXT differs from PLAN B and PLAN B PLUS in the concentrations of Levonorgesterol(the synthetic Progesterone) I would vouch on it till 72 hours of unprotected sex after taking the pill and not more than that.