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On Yasmin (drospirenone and ethinyl estradiol) and took modafinil. I read it lessens effectiveness of preventing pregnancy and must use protection 2 months. What are the percentages?

1 doctor weighed in
Dr. James Rochester
Family Medicine

In brief: Not known

modafinil increases the activity of certain enzymes in the liver that process progesterone, a hormone used in many birth control pills.
This can cause progesterone levels to be lower than expected, leading to decreased effectiveness at preventing pregnancy. This has not actually been studied (ie women on BCP, women on BCP and modafinil. How many get pregnant?). No % available. Sorry.

In brief: Not known

modafinil increases the activity of certain enzymes in the liver that process progesterone, a hormone used in many birth control pills.
This can cause progesterone levels to be lower than expected, leading to decreased effectiveness at preventing pregnancy. This has not actually been studied (ie women on BCP, women on BCP and modafinil. How many get pregnant?). No % available. Sorry.
Dr. James Rochester
Dr. James Rochester
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