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Navigate: FAQ Home Page > Birth Control & Safer Sex > Q&A
Posted on: 01/16/2009
Question
Will topamax decrease the effects of Loesterin 24fe? I heard it might and I took the morning after pill to be safe? Am I ok?
Answer
Topamax CAN decrease the effects of Loestrin 24Fe by lowering the amount
of hormone in Loestrin and other estrogen and/or progestin-containing
birth control pills. If you took the morning-after pill within a few
days of having sex, you are unlikely to become pregnant. Morning-after
pills (like Plan B) are most effective when started within 72 hours, but
may still be effective beyond that (up to 5 days after unprotected sex).
While taking Topamax, the safest thing to do to prevent pregnancy is to
use a back-up method that does not contain hormones. Examples of
nonhormonal contraceptives include condoms and diaphragms.
Answered By:
Joyce Lin, PharmD
Joyce Lin, PharmD