Ruling 415:
The recommended precaution is that during the entire day that a mustaḥāḍah is fasting, she should prevent the blood from coming out as much as she can.
-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)
Purity: Fasting and Istiḥāḍah
Practical Laws of Islam as per the teachings of Ayatullah Sistani
