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Overview
Errin is a prescription drug that was approved by the U.S. Food and Drug Administration (FDA) in 1973 to prevent pregnancy. Errin is also prescribed to treat symptoms of endometriosis. Errin may be referred to by its drug names, norethindrone and norethisterone.

Errin is a contraceptive, or drug used to prevent pregnancy. Specifically, Errin is a progestin, a synthetic form of the hormone progesterone. Errin is believed to work by changing hormone levels and controlling the growth of the uterine lining.

How do I take it?
Errin is taken orally once a day. Your doctor will likely begin you on a very low dose of Errin and increase the dosage gradually.

Consult your doctor before you stop taking Errin.

Always follow your doctor’s instructions exactly when taking Errin.

Side effects
Common side effects of Errin include changes in menstrual flow, weight gain, stomach upset, trouble sleeping, nausea, bloating, acne, abnormal vaginal bleeding, and swollen or painful breasts. Many of these side effects fade after several weeks of taking Errin.

Serious side effects of Errin can include blood clots, ectopic pregnancy, ovarian cysts, irregular genital bleeding, and cancer in the breast or reproductive organs. The risk of these serious side effects is increased in women who smoke or are over 35. Errin may cause birth defects if taken during pregnancy.

Some women with depression may notice that it becomes worse while taking Errin.

Notify your doctor if side effects worsen. Call your doctor if you experience vision changes, weakness on one side, pain in your chest, jaw, or left arm, swelling or warmth in your groin or calf, severe abdominal pain, sudden, heavy vaginal bleeding, yellowing of the eyes or skin (jaundice), a sudden, severe headache, dizziness, or confusion.

For more details about this treatment, visit:

Errin — GoodRx
https://www.goodrx.com/errin/what-is

Errin (Norethindrone) for Endometriosis Questions

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