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Errin is an oral contraceptive that is available by prescription. It is a progestin-only pill that is most commonly used by breastfeeding women and women who should not take estrogen. Since this pill is not very effective at stopping ovulation, it also works to prevent pregnancy by altering the endometrium and cervical mucus. Potential side effects include irregular menstrual periods, nausea, and headache.

What Is Errin?

Errin® (norethindrone) is a prescription oral contraceptive, also known as a birth control pill. It is a generic version of Ortho Micronor®. Unlike most birth control pills, Errin does not contain estrogen (it contains only a progestin hormone). As a progestin-only contraceptive (also known as a "mini-pill"), it is an ideal choice for breastfeeding mothers and other women who should not take estrogens.
(Click What Is Errin Used For? for more information, including possible off-label uses.)

Are There Side Effects?

As with any medicine, side effects are possible with Errin. However, not everyone who uses the contraceptive will experience side effects. In fact, most people tolerate it quite well.
If side effects do occur, in most cases, they are minor and either require no treatment or can easily be treated by you or your healthcare provider. Serious side effects are less common.
Common side effects of Errin include, but are not limited to:
  • Irregular menstrual periods
  • Headaches
  • Breast tenderness
  • Nausea.
(Click Side Effects of Errin to learn more, including potentially serious side effects that you should report immediately to your healthcare provider.)
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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