Latin potio is simply a drink, a draught; French split the inheritance, poison keeping the harmful sense while English potion kept the medicinal-magical one, the same word sorted by outcome. The classical potion was the standard dosage form, Homer has Helen's nepenthe cast into wine, Circe's pharmaka stirred into the cup that unmanned Odysseus's crew, and the medieval medical literature runs on potiones, prescribed drinks. The word's magical register is documented early, the love-potion and the death-draught sharing the grammar, because the cup, not the contents, carried the intent.
The love-potion is the folklore's largest category and its most honest one: the philtre that works in the stories works by dosage and consequence, Tristan and Iseult's shared draught, the Lucretius case, where a love-potion reportedly drove the poet mad, the tradition keeping a meticulous ledger that the love-potion's effects are indistinguishable from poisoning, obsession as toxicity. The Greeks knew it, the iynx file in this archive is the same technology: the potion is the jinx you can pour, and the folklore never once pretended the pourer was innocent.
The claim: the potion is the archive's liquid file on the spellword thesis, the drink that works because the cup came with a story, placebo before the word, the ritual of preparation doing what the pharmacology could not, and every modern functional beverage, energy drink, adaptogen latte, inheriting the exact technology: the promise in the cup, priced by the story. Verdict: the placebo literature documents the mechanism without the mythology. The Greeks put the drug in the wine and the word in the air, and both did measurable work. The archive's verdict on the whole pharmacopoeia wing belongs here: the ancients never separated the substance from the story. We separated them and built two industries, one for each. The cup remembers being one.
If the potion and the poison are one drink, what decided the difference: the brewer, the dose, or the story told with the cup?