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GlossaryNorethisterone

synthetic hormone used in birth control and hormone therapy

Norethisterone, also known as norethindrone, is a synthetic form of the hormone progesterone. It is commonly used in hormonal contraceptives and hormone replacement therapy to regulate menstrual cycles, treat endometriosis, and manage symptoms of menopause.

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research Effects of 17 Alpha-Ethinylestradiol, Norethindrone, and Levonorgestrel on Root Growth of Arabidopsis Thaliana

January 2006 in “Xibei zhiwu xuebao”

Norethindrone and levonorgestrel can enhance or inhibit root growth in Arabidopsis thaliana depending on the concentration.

research Studies of the Components of an Oral Contraceptive Agent in Albino Rats: Progestogenic Component and Comparison of Effects of the Components and the Combined Agent

24 citations, July 1980 in “Journal of Toxicology and Environmental Health”

High doses of norethindrone acetate in rats caused various organ changes but didn't significantly increase tumor rates.

research Problems in Evaluating Chronic Toxicity of Contraceptive Steroids in Dogs

25 citations, September 1977 in “Journal of Toxicology and Environmental Health”

High doses of some contraceptive steroids cause health issues in dogs, but their relevance to humans is unclear.

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