Large-fruited Elm Seed Paste Classic Formulas … Natural Herb Library

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Expels intestinal parasites - Wu Yi is a classic processed elm-fruit medicine for worm accumulation, especially when abdominal pain, poor appetite, or pediatric thinness accompany infestation.
Reduces food accumulation and supports digestion - it is traditionally used when parasites and stagnant digestion reinforce one another, producing distension, foul appetite, or childhood gan ji patterns.
Relieves parasite-related abdominal pain - the herb is chosen when cramping, restlessness, or malnourished digestion point to worms rather than to simple qi stagnation alone.

Hua Chong Wan and related antiparasitic formulas - Wu Yi is paired with Bing Lang, Lei Wan, or other worm-expelling herbs when abdominal pain and food accumulation are both prominent.
Pediatric gan ji formulas with Shen Qu, Mai Ya, or qi-regulating herbs - used when worm burden coexists with poor appetite, abdominal fullness, and undernourished children.
Wu Yi San lineage preparations - simpler powder-style uses centered on killing worms and reducing accumulation.

TCM Wiki describes Wu Yi as pungent, bitter, and warm, with the core actions of expelling parasites and promoting digestion.
Classical material preserved in the Shen Nong Ben Cao Jing tradition states that Wu Yi eliminates the three worms and transforms food accumulation, which remains the clearest traditional summary of the herb.