Norethisterone is a medication commonly indicated for delaying periods. It contains northindrone as its active ingredient which is a synthetic progestin, quite similar to the progesterone that we produce naturally.

How Does Norethisterone Work?
Menstruation begins when the levels of progesterone drop. Progesterone is responsible for thickening the lining of the uterus and keeping it prepared for a fertilized egg. But, after ovulation when the egg is not fertilized the levels of progesterone fall and lining the uterus starts shedding.

So, when you take norethisterone a few days before your period is due, the man-made progestin replaces progesterone and the lining of your uterus remains intact. In simpler words norethisterone works by mimicking the effects of naturally produced progesterone.

How Does Norethisterone Stop You from Getting Pregnant?
The two hormones which are responsible for ovulation are Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). When a period delay tablet, like norethisterone is taken before menstruation, it inhibits the secretion of both FSH and LH and prevents ovulation. And since there is no egg in your fallopian tube, you can’t get pregnant.

Norethisterone also make your vaginal fluid thicker making it harder for the sperm to reach and fertilize an egg.

It also causes changes in the lining of your uterus which prevents the attachment of the egg on the uterine wall.

If you are taking norethisterone to prevent pregnancy keep in mind that it will not consistently prevent ovulation. The combination pill (estrogen-progestin), also known as birth control is far more effective than just progestin pills like norethisterone tablets. It is usually prescribed as a pregnancy prevention tablet to women who can’t take estrogen.

Does Norethisterone Carry Any Side Effects?
Norethisterone is mostly used to delay your periods and for that purpose it is absolutely safe to be used occasionally.

A person taking norethisterone may experience following side effects:

• Low mood.
• Acne.
• Breast tenderness.
• Fluid retention.
• Loss of libido.

Keep in mind that using this medication will not protect you or your partner from sexually transmitted diseases.