Purity: Excessive Flatulence and Wudu

Practical Laws of Islam as per the teachings of Ayatullah Sistani

Ruling 314:

If someone suffers from an illness that does not allow him to stop passing wind [i.e. excessive flatulence], he must act in accordance with the duty of those who cannot control the discharge of urine and faeces.

-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)