Does the discharge of oily stool onto the trousers as a result of taking weight-loss pills invalidate ablution (Wudu') and prevent prayer (Salat)?
As long as fat exits from either of the two passages, it is impure and invalidates ablution. Prayer is not valid with such impurity on one's clothes.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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