A staple of the Chinese household medicine cabinet. The formula dates to the Song-dynasty 《太平惠民和剂局方》. Warning: the liquid version contains alcohol, so drivers switch to 藿香正气软胶囊 (soft capsules).
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The 正气 here is TCM jargon for 'upright qi' — the body's own defensive energy — not the everyday 'righteousness' meaning.