Taking pills to delay menstruation
The inquirer says that his wife uses contraceptive pills. Each month she takes 21 pills and then stops taking them for the next seven days during which she will have her menstrual period. She wants to continue taking these pills during the month of Ramadan so that she can interrupt menstruation and not have to break her fast. Is this permissible?
Menstruation is a legal excuse for not fasting and praying
It is impermissible for menstruating women to fast or pray. However, there is no objection to fasting and praying if menstrual flow stops naturally or by taking medicine.
It is permissible to take pills to delay menstruation. Any pills taken to prevent menstruation must be prescribed by a physician to avoid harm following the legal maxim that states, "Do not cause harm and do not reciprocate harm."
And God Almighty knows best.