Should a woman abandon prayer and fasting during her days of menstruation if she menstruates for seven days, becomes pure for one day, then menstruates for another seven days and becomes pure for one day, due to using birth control medication, after her regular cycle was seven days of menstruation and purity for an entire month?

If a woman experiences bleeding for more than a month and only has a few days of purity, she is considered to be in a state of istihadha (non-menstrual vaginal bleeding). A woman in istihadha acts according to her situation: 1. If she has a regular, established habit: She abstains for the duration of her habit, then performs ghusl (ritual bath), prays, and fasts for the rest of the month, as Fatimah bint Abi Hubaysh did. 2. If she does not have a regular habit or has forgotten it, but can distinguish between the blood types: She distinguishes between menstrual blood (which is black, has a foul odor, and is thick) and istihadha blood (which does not have these characteristics). If it is menstrual blood, she abstains from prayer. If it is istihadha blood, she performs wudu (ablution) and prays. 3. If she has neither a habit nor the ability to distinguish: She abstains for six or seven days (which is typically the duration of menstruation), then performs ghusl and prays for the rest of the month, as Hamnah bint Jahsh did. It is also permissible for her to combine prayers and perform ghusl for each prayer, or perform ghusl once for Dhuhr and Asr, once for Maghrib and Isha, and once for Fajr.

It is advisable to consult a doctor to change the medication and treat the issue.