Key takeaways
Endometrin (progesterone) and norethindrone acetate (Aygestin) are both used to address hormonal issues, but they serve different purposes and are administered differently. Endometrin is a vaginal insert or suppository used primarily in fertility treatments to help prepare the uterus for pregnancy, while norethindrone acetate is an oral medication used to treat absent menstrual periods, abnormal vaginal bleeding, and endometriosis. Endometrin must be used 2 to 3 times a day and is only available as a brand medication. In contrast, norethindrone acetate is taken once daily and is available as a lower-cost generic. Endometrin can cause vaginal irritation and requires careful handling during insertion, whereas norethindrone acetate can lead to side effects like breakthrough bleeding, headaches, and potential weight changes. Both medications carry risks of serious side effects, such as heart attack and stroke, but norethindrone acetate also has specific warnings about vision changes and fluid build-up.
