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In page Morphine:

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Many salts of morphine are used, with the most common in current clinical use being the hydrochloride, sulfate, tartrate, and citrate;[citation needed] less commonly methobromide, hydrobromide, hydroiodide, lactate, chloride, and bitartrate and the others listed below.[citation needed] Morphine diacetate (heroin) is not a salt, but rather a further derivative,[citation needed] see above.[2]