Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh.
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
What you are experiencing is called istihadah (bleeding outside the normal period). You should stop fasting and prayer only for the same number of days you are accustomed to having your menses. After this period you must take a purificatory bath (ghusl) and to resume prayer, fasting, etc.
In his response to your question, Sheikh Ahmad Kutty, a senior lecturer and Islamic scholar at the Islamic Institute of Toronto, Ontario, Canada, states:
The bleeding you are experiencing in this case cannot be considered as menses. It is rather comparable to bleeding of istihadah (abnormal bleeding). Therefore, the rules of hayd (menses) do not apply to your case. Rather you should follow the rules of istihadah.
To be more specific, you are advised to look at the pattern of your menses prior to taking the pills, and simply follow the same.
After that time you are required to take a complete ghusl (ritual bath) just as you would do when your period completely stops.
Following the ghusl, you must resume prayer, fasts, etc., as if you were totally free of menses. The only exception would be this: You need to clean your private parts and perform wudu (ablution) prior to each prayer. You are best advised to perform wudu as close to the intended prayer as possible.
Allah Almighty knows best.
Editor’s note: This fatwa is from Ask the Scholar’s archive and was originally published at an earlier date.