Errin

What is Errin?

Errin is a progestin-only birth control pill, also called a “mini pill.” It contains norethindrone, a synthetic version of the hormone progesterone. Unlike combined pills, Errin doesn’t contain estrogen, so it’s often recommended for people who are sensitive to estrogen, or have a higher risk of blood clots, migraines, or high blood pressure.

Mini pills like Errin can also make periods lighter, more regular, or stop them altogether.

How does Errin work?

Errin works in some people by preventing ovulation, so your ovaries don’t release an egg. It mainly works by thickening cervical mucus, which blocks sperm from getting through, and by thinning the womb lining, which makes it difficult for a fertilized egg to implant. These all work to make it much harder for you to become pregnant.

What doses of Errin are there?

Errin only comes in one dose, with 0.35mg of norethindrone. You only need to take one pill every day for it to be effective. If you’re using norethindrone for something else, like heavy or painful periods, a doctor might prescribe you a higher dose.

How to use Errin

Choose a time of day that’s easy to stick to. You’ll need to take Errin at that exact time every day. Being more than three hours late can lower your protection, so setting an alarm or adding it to your routine helps.

Each pack has 28 pills. Just follow the arrows on the blister pack until it’s done, then start the next pack the very next day.

What should I do if I make a mistake when using Errin?

If you forget to take Errin at your usual time, take it as soon as you remember. Then take your next pill at the regular time, even if that means two pills in one day.

If you’re more than 3 hours late taking it, you’ll also need to use a backup method (like condoms) for 48 hours.