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Women's Health

Birth Control and Thyroid

03/09/2010

Question:

If on birth control for more than a year and begin thyroid therapy, can this can irregular or breakthough bleeding? I am currently on Seasonique and levothyroxine 75.

Answer:

Starting levothyroxine will not affect the efficacy of Seasonique. However, continuous oral contraceptives such as Seasonique are associaiated with more breakthrough bleeding and spotting than the cyclic pills.

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Response by:

Debra K Gardner, PhamD Debra K Gardner, PhamD
Assistant Clinical Professor of Pharmacy
College of Pharmacy
The Ohio State University