Another thing to think about is that women using vagifem or estriol only, daily, are already using unopposed estrogen, dosage 10-25mcg. Some can and do have some systemic effects of bloating tummy, tender breasts and sometimes headaches.
There is is no talk of opposing this therapy with progestin or progesterone even yearly.
Menostar is only 0.14mcgs a week! I think that must be less.,
DG Menostar is a patented hormone therapy made by the drug companies its just not on the list in the UK or sanctioned by the NHS.
Some more info http://www.webmd.com/menopause/news/20040610/low-dose-estrogen-patch-gets-fda-nod
I need to clarify for everyone - this is incorrect, and it is important to understand what the different dosages mean.
The dosage given for patches is not the total amount in the patch, but the amount that is designed to be delivered into the system (on average) in 24 hours.
A Menostar patch delivers 14 mcg oestradiol per 24 hours, (just as my 50 mcg patch deliver 50 mcg in 24 hours). so about 100 mcg per week. The actual patches contain more oestrogen than this. The Menostar patch contains 1 mg oestradiol so a lot of what is in the patch is lost ( 1 mg = 1000 mcg),
Vagifem is completely different - a Vagifem 10 mcg tablet contains only 10 mcg in total which is 20 mcg per week, and only a fraction of this is absorbed ( haven't looked this up recently). The same goes for Vagifem 25 mcg. (a total of 50 mcg per week of which a fraction will be absorbed).
They also can't be compared (ie oestrogen patches and vaginal oestrogen patches) due to the mode of delivery - once vaginal tissues are plumped up then there is very little systemic absorption (which is as intended). whereas patches are designed specfically to allow systemic absoprtion.
Once this is understood you can see why no progestogenic opposition is necessary with Vagifem - although a few authorities do recommend a progestogen challenge now and again to be ultra cautious (or so I have read).
Since in the case of Menostar progestogens are recommended by the manufacturer (as I reported below), then I imagine those in US prescribing it do so on this basis.
Hurdity x