anastrozole · Medicine question

Are there human data on anastrozole use during pregnancy?

iatroX medicinesPublished 8 November 2026

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There are no data on Arimidex (anastrozole) use in pregnant women; animal studies have shown reproductive toxicity, and Arimidex is contraindicated during pregnancy.

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Arimidex 1mg Film-Coated TabletAstraZeneca UK Limited · emc · SmPC §4.6 Fertility, pregnancy and lactation · Version 31Document updated 27 August 2026

Sources checked 8 November 2026

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Can anastrozole (Arimidex) be used during pregnancy or breastfeeding?Have the effects of anastrozole on human fertility been studied?Can anastrozole (Arimidex) cause joint pain or stiffness?Does anastrozole (Arimidex) affect the ability to drive or use machinery?Does anastrozole have any oestrogenic, androgenic or progestogenic activity?Is anastrozole (Arimidex) indicated for breast cancer prevention in postmenopausal women at moderate or high risk?

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