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You can take the Duphaston
course again and stopping it will result in menses.
But ideally these medicines should be taken in consult with a local clinician because they can cause unforeseen serious adverse reactions.
These medicines are sex hormones and affect the rhythm of natural hormones and hence affect the natural schedule of menses.
They should be avoided if not utterly necessary.
I hope the advise would be informative and useful for you.