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Dictionary · Drug

diethylstilbestrol

A man-made estrogen, once given in pregnancy to prevent miscarriage, no longer used in the US.

dy-eth-il-stil-BES-trol noun

What it means

A synthetic estrogen (DES) prescribed to millions of pregnant people from the 1940s to 1971, when it was found to harm babies exposed before birth. Daughters exposed in the womb ("DES daughters") have a higher risk of a rare vaginal and cervical cancer (clear cell adenocarcinoma), differences in the shape of the reproductive organs, and pregnancy problems. It was later used only rarely, for prostate and breast cancer.

For the nurse

When taking a health history, ask older clients whether their mother took DES in pregnancy: exposed daughters need regular gynecologic exams.

At a glance

Drug classsynthetic nonsteroidal estrogen
AbbreviationsDES
Spanishdietilestilbestrol
Also writtenHonvol

Related terms

estrogen

A female sex hormone, made mainly by the ovaries, and the group of drugs that act like it.

teratogen

Anything a pregnant person is exposed to that can cause birth defects in the developing baby.

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