<p>Pregnancy category B3. Estradiol is contraindicated during pregnancy. If pregnancy occurs during medication with Estradiol, treatment must be discontinued immediately. In animal studies, maternal administration of high doses of synthetic oestrogens produced urogenital malformations in the offspring. However, the relevance of the animal findings for the clinical use of 17b-oestradiol is uncertain. Estradiol is contraindicated during lactation</p>