It is better not to take Sidi Iodine tablets when you are pregnant. It is mainly used for chronic pharyngitis, mouth ulcers, chronic gingivitis and periodontitis. The instructions of Cidi Iodine Tablet clearly indicate that it should be used with caution by pregnant and lactating women, so it is better not to use Cidi Iodine Tablet during pregnancy. Therefore, if you have a mouth ulcer and you are pregnant, you may not choose to use topical cidiol tablets and you can wait for the mouth ulcer to heal on its own.