Hi there michelleu
Just to say I agree with the others - and yes it is the same stuff. I have only ever used it vaginally. In fact though the French instructions that I have actually give the same dose for vagonal as for oral use although as Mary G says much gets lost to digestion in this way. A limited amount of research suggests that on average half the dose can be used for vaginal delivery vs oral use - although this is off licence.
Yes you are starting with a very small amount of gel so with your doc's approval you should be able to take a smaller amount of utrogestan if using it vaginally. It does also depend on where you are in menopause, what your cycle has been doing recently, how heavy your periods are and whether you have fibroids, polyps or endometriosis so it's not a "one-size fits all". Personally I would err on the side of caution to start with and take it for the licensed amount of time ( 12 days) x 100 mg vaginally. Then see how you feel after two or three months and what sort of bleed you get.
Despite your saying that your doc doesn't know much about HRT, it sounds like s/he is playing ball re giving you the bio-identical hormones ie those that are the same as produced in our body - estradiol and progesterone.
In the months (or even years) leading up to peri-menopause, before periods begin to become irregular and when they sometimes shorten, many women experience worsening pms symptoms and moods as hormonal changes begin to occur even when the ovaries are still functioning. Some women do find that a low dose oestrogen at this point really does help.
The advantage of taking a slightly higher dose of progesterone than perhaps you need at this stage, if you are happy on it, is that it can help limit the heavy bleeding common in peri-menopause and especially if you have anovulatory cycles (ovulation does not occur, and the womb lining builds up until ovulation happens and a period comes).
As the others have said - don't look for problems and go into it with an open mind and positive outlook - you can't avoid menopause but these treatments are designed to mitigate the worst effects and help you to feel better overall.
Good luck and let us know what you decide and how you get on
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Hurdity x