Women of childbearing potential: Patients of childbearing potential should use effective contraception during treatment with fulvestrant and for 2 years after the last dose.
Pregnancy: Fulvestrant is contraindicated in pregnancy (see Contraindications). Fulvestrant has been shown to cross the placenta after single intramuscular doses in rat and rabbit. Studies in animals have shown reproductive toxicity including an increased incidence of foetal abnormalities and deaths (see Pharmacology: Toxicology: Preclinical safety data under Actions). If pregnancy occurs while taking fulvestrant, the patient must be informed of the potential hazard to the foetus and potential risk for loss of pregnancy.
Breast-feeding: Breast-feeding must be discontinued during treatment with fulvestrant. Fulvestrant is excreted in milk in lactating rats. It is not known whether fulvestrant is excreted in human milk. Considering the potential for serious adverse reactions due to fulvestrant in breast-fed infants, use during lactation is contraindicated (see Contraindications).
Fertility: The effects of fulvestrant on fertility in humans has not been studied.