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Greetings of the dayRegestrone
is Oestrogen preparation given to postpone cycle, it acts by maintaining the serum oestrogen level to prevent shedding of endometrium and initiating period. Once its stopped, the hormone level falls and period is initiated in next few days.
The next cycle is usually ovulatory and the normal precaution of preventing unwanted pregnancy
In case you need any further assistance, will be glad to assist you.
Wishing you happy and healthy life
Dr Deepak K K