19th-Century Doctors Prescribed a Dangerous Douche: Liquid Mercury

Patients dabbed it on their sores or inhaled it. Doctors administered it using a device made by a French instrument-maker: a receptacle for holding the liquid mercury compound, with a green hose and attachments of various sizes for insertion into the vagina or urethra.

source https://www.webmd.com/sexual-conditions/features/mercury-douche?src=RSS_PUBLIC