Can a woman who has taken pills to stop menstruation, and sees a brownish discharge when wiping with tissues, pray, fast, and go to the mosque?

A wife must wait for purity as long as she sees a brownish discharge during her menstrual period. It is not permissible for her to pray or fast until she becomes pure, because brownish and yellowish discharges during the customary period are considered menstruation, according to the preponderant and authoritative opinion.