Shabbat – Powder for Internal Constipation

Shalom, I am being treated with Normaflax powder every day, together with a drink, for chronic constipation, which causes me fecal leakage. Am I allowed to take it also on Shabbat, and is there any concern of kneading (lisha) because of some crystals that usually solidify at the bottom of the cup even after much stirring? I would like to stress that I do not suffer from the discomfort of constipation; rather, it is only an internal constipation that causes fecal leakage.

Shalom u-vracha.

A. It is permitted to take it on Shabbat.

B. There is no problem with the fact that sometimes some powder remains stuck. This is not a psik reisha, and you certainly do not care about it (lo nicha lei).

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