Norethindrone
Norethindrone is a synthetic progestin used with estrogen in HRT to protect the uterine lining, available alone or in combination patches like CombiPatch.
How it works
Norethindrone (also called norethisterone; acetate form is NETA) is a synthetic progestin that binds progesterone receptors and prevents endometrial hyperplasia when combined with estrogen therapy. It has some androgenic activity — partial binding to androgen receptors — which distinguishes it from bioidentical progesterone and from less androgenic progestins. This androgenic activity can be beneficial for some people (libido, energy) and problematic for others (acne, oily skin). Norethindrone has a long clinical history in hormone therapy and contraception.
Unlike bioidentical progesterone, norethindrone does not produce the GABA-A neurosteroid metabolites that improve sleep. Like other synthetic progestins, it is more potent per milligram than bioidentical progesterone for endometrial protection, which is one reason combination patches (CombiPatch delivers norethindrone acetate alongside estradiol) can use smaller progestogen quantities. Some people experience mood changes or bloating with norethindrone that differ from their experience with other progestogens.
How to track Norethindrone
- Breakthrough bleeding or spotting — the most clinically important tracking variable on any progestogen-containing regimen.
- Mood changes — norethindrone's androgenic activity can affect mood in either direction; tracking mood alongside progestin type is useful for comparative data.
- Androgenic side effects: acne, oily skin, or hair changes — particularly relevant for norethindrone compared to less androgenic progestogens.
- Sleep quality — norethindrone lacks the neurosteroid sleep benefit of bioidentical progesterone; tracking sleep separately helps assess whether the progestogen choice is contributing.
- Breast tenderness and bloating as dose-response indicators.
- Log all bleeding and spotting with dates, description (light/moderate/heavy), and cycle day if applicable — this is the most diagnostically important data on any progestogen regimen.
- Track androgenic side effects (acne, oily skin) separately from general side effects — they have a different mechanism and different implications for progestin switching.
- Note mood changes with timing relative to your progestin dosing schedule — if mood changes cluster around norethindrone days, that is a pattern worth flagging.
- If you switch from norethindrone to bioidentical progesterone (or vice versa), use the switch date as a new baseline for mood, sleep, and bleeding pattern tracking.
- Record the exact date of any dose changes so pre- and post-adjustment windows are clearly separated in your log.
Questions to ask your physician
- I've been logging breakthrough bleeding on [dates and description]. What does that pattern suggest about my regimen?
- My mood tracking shows [pattern] — particularly [improvement/worsening] that correlates with norethindrone days. Is that consistent with the androgenic activity of this progestin?
- I've been logging acne and oily skin since starting norethindrone on [date] — here is the pattern. Does that suggest switching to a less androgenic progestogen?
- My sleep tracking has not improved with HRT. Given norethindrone lacks the neurosteroid sleep effect of bioidentical progesterone, should we discuss switching progestogens?