Black draught was a patent medicine used […] with veterinarians prescribing these to constipated cattle and horses. It is a saline aperient mixture used along with blue mass.

blue mass contained excessive amounts of [mercury]: a typical daily dose of two or three blue mass pills represented ingestion of more than one hundred times the daily limits set by the Environmental Protection Agency in the United States today.

Umm, so senna, epsom salts, basically a laxative. Is this a shitpost? The article mentions it often being used with Blue Mass (https://en.wikipedia.org/wiki/Blue_mass), and that’s the scary one, as it’s mostly quicksilver a.k.a. mercury.

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