What are micronor (norethindrone) side effects?

Minor. Micronor (norethindrone) is a Progesterone only contraceptive. Se are rare but could be similar to the pms time of your cycle, such as bloating, breast tenderness, mood swings, headache, acne, or weight gain. It is not quite as effective as the pills containing estrogen but is often used when estrogen needs to be avoided, such as breast-feeding, migraines, or clotting history.