Yeast Prophylaxis Treatment in First Trimester Pregnancy

Safety Considerations

The Infectious Diseases Society of America recommends that oral azole antifungals, such as fluconazole, should be avoided during the first trimester due to potential teratogenicity 1, 2, 3
The FDA has issued warnings that high-dose fluconazole (400-800 mg/day) during the first trimester may be associated with birth defects 3
If systemic treatment is absolutely necessary during the first trimester, intravenous amphotericin B is recommended instead of oral azoles 1, 2, 4
After the first trimester, oral azole antifungals such as fluconazole or itraconazole may be considered if needed 1, 2

For women with a history of coccidioidomycosis, the risk of reactivation during pregnancy is low and prophylactic antifungal therapy is not recommended, but close monitoring with serologic testing every 6-12 weeks should be performed 1, 5
For women already on azole therapy who become pregnant, the medication should be discontinued during the first trimester with clinical and serological monitoring every 4-6 weeks 5, 6

Oral fluconazole should not be prescribed for prophylaxis during the first trimester due to potential teratogenic effects 3