Before you begin treatment with Brexafemme, inform your doctor:, Of all the medications you take, including prescription and over-the-counter medications, vitamins, and herbal supplements, Of your allergies, Of your health problems, Of your pregnancy status. Brexafemme may cause harm to an unborn baby. Effective birth control methods should be used during treatment. Of all the medications you take, including prescription and over-the-counter medications, vitamins, and herbal supplements, Of your allergies, Of your health problems, Of your pregnancy status. Brexafemme may cause harm to an unborn baby. Effective birth control methods should be used during treatment.