Hi CherryC
Not sure if this research has been updated but there was a study a while back which looked into this - and found that the speed with which you stop HRT had no impact on the final outcome ie whether or not you would get a resumption of flushes and sweats (can't remember if this is all they looked at....). In other words the long term flushers will get them coming back eventually whereas those for whom flushes would have happened (without HRT) for a shorter period of time (years?, months?) did not experience a resumption. Not sure if I've explained that very well!
However the speed of stopping will surely affect how you feel as you come off the hormone irrespective of the final outcome. It makes sense that, just as it is recommended to increase oestrogen doses slowly to allow the body to acclimatise before going higher, that reducing gradually will minimise the shock to your body of sudden withdrawal of oestrogen.
Also it is important to keep on with the progesterone while you are still taking the oestrogen so even if you reduce to a lower dose of gel, keep in with the Utro and aim to stop both at the same time. It's not necessary to taper off the progesterone and maybe not wise, because it is protecting your womb while you are taking it.
Most women experience some sort of withdrawal when stopping utrogestan or any progestogen - but this is normal pms and the effects should not last beyond a few days, until it has cleared your system.
Depending on your age and other factors, some consequences of oestrogen reduction post-menopause appear many years later eg osteoporosis although there is a strong genetic factor I gather, and other factors relating to diet, BMI etc.
Hope this helps
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Hurdity x