Return of Blood After Stopping Menstrual Regulating Medication

Question
A woman was given medication by her doctor to regulate her menstruation; she used to menstruate for 8 days and be pure for 20 days. This was her condition for six months. Then the doctor asked her to stop the medication, and she was pure for 11 days, after which the blood returned. The doctor advised her to return to the medication to regulate her menstruation again, considering that what the woman saw 15 days after the start of her purity was menstruation (even though the purity was not correct as it started with 10 days of cleanliness and then the blood returned). What is the ruling on this woman regarding her menstruation and purity?
Answer
I say, and with God's help: If the medication regulates her menstruation as previously mentioned, then what is regulated from menstruation and purity is considered valid, as long as the menstruation is less than 110 days and the purity is more than 15 days, and God knows best.
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