Grassleaf Sweetflag Rhizome Classic Formulas … Natural Herb Library

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Opens the orifices and transforms phlegm-turbidity - Shi Chang Pu is classically used for clouded consciousness, epilepsy, dizziness, deafness, or foggy thinking when phlegm blocks the clear Yang.
Calms the Spirit and benefits cognition - it is applied in forgetfulness, poor concentration, insomnia with turbidity, and emotional disturbance when the Heart is not communicating clearly.
Aromatically transforms dampness and harmonizes the middle - traditional use includes nausea, poor appetite, abdominal fullness, and foul turbidity affecting digestion.

Ding Zhi Wan - classical combination with Ren Shen, Fu Ling, and Yuan Zhi for phlegm clouding, forgetfulness, fright, and disturbed sleep.
Chang Pu Yu Jin Tang - warm-disease style pairing for phlegm-heat obstructing the Heart orifices with confusion, agitation, or muttering.
Di Tan Tang - formula logic for epilepsy, stroke, or dizziness in which phlegm blocks the orifices and clear Yang cannot rise.

TCM Wiki describes Shi Chang Pu as acrid, bitter, and warm, entering the Heart, Spleen, and Stomach to open the orifices, vaporize phlegm, and harmonize the middle.
Me & Qi similarly emphasizes the Acorus tatarinowii rhizome as a bridge between phlegm-turbidity obstructing the Heart and damp obstruction affecting digestion.
The herb's reputation for benefiting hearing, cognition, and memory depends on its ability to clear turbidity rather than on a purely tonic action.