Hi Kiwi Fran
As well as with a combi patch, norethisterone is also prescribed as part of combi oral HRT.
You can see the preparations here for peri and post-menopause ie cyclical or continuous use:
https://www.menopausematters.co.uk/perimeno.phphttps://www.menopausematters.co.uk/postmeno.phpYou will see that the dose varies according to oestrogen dose so for low and medium dose oestrogen, during perimenopause the dose is 1 mg per 12 days in a 28 day cycle, and for post-menopausal continuous dose - 0.5 mg for low dose oestrogen and 1 mg for higher doses.
If you have heavy periods though the dose is usually higher according to the product information.
https://www.medicines.org.uk/emc/product/1494/smpc#grefI think you should be guided by your periods as to whether it is working or not, although the information on dosing is readily available.
As sheila99 says you would probably be better off on a cyclical regime and then at least your periods ( if you are still having them) will be predictable. Also are you able to cut the tablet accurately because variation in the dose could also cause variable side effects?
You haven't said how old you are but also you might benefit from increasing the oestrogen dose too?
Hurdity x