枇杷膏 - loquat leaf cough syrup - is a household remedy across Chinese-speaking regions. The leaves 枇杷叶, not the fruit, do the medicinal work, boiled with honey and herbs.
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Both characters share the wood radical 木 because it's a tree. Not to be confused with homophone 琵琶 (the lute) - same sound, different radicals (王 for the instrument, 木 for the fruit).
