@Lazery This has been changed in practice to daily not 25 days.
See this link.https://www.menopausematters.co.uk/postmeno.php
POST MENOPAUSAL -
Continuous combined therapies.
"Period free" or continuous combined therapy can be used by women who are 54 + yrs, or more than one year since last period at any age.
The criteria should be fulfilled in order to offer such treatment to women who no longer have a continuing ovarian cycle, so that steady levels of both estrogen and progestogen can be achieved.
When there are steady levels of estrogen and progestogen from daily administration of both, the womb lining stays thin.
Although some bleeding in the first 6 months of therapy is common, there should not be bleeding after that and the lining does not go through the stages of stimulation and then shedding as it does during a normal cycle and with sequential therapy.
UTROGESTAN Micronised progesterone 100mg at bedtime from day 1 to 25 of each 28 day cycle (licensed regimen), though taken every day is usually recommended
^^The regimen is for women post menopause.
The likelihood of a withdrawal bleed on 25 days is quite unlikely. It's there as a type of 'insurance' if there is any lining to come away but in post meno women there isn't.
@Didisquat If you more or less regular periods you should be using the sequential/cyclical regimen of 12 days per month.
The best way to start this is to choose the same day every month (ie 1st) and stick to it. In time, your own natural cycle will fall into the pattern set by HRT.
Sadly, there are posts here almost daily where GPs just dont know how to prescribe.