Barium is used for rat poison.
Barium is used as a rat poison.
Arsenic
arsenic
arsenic
Several. Arsenic was once used as a rat poison and also has use in medicine (bone marrow disorders as an example. Thallium was once used as a rat poison and was once used to treat Syphillis Barium used to be used in rat poison and is used in medicine (barium meal) for some types of scan. Mostly these days however it is a compound that applies to both rather than an element - that being Warfarin.
arsenic
Arsenic is used in rat poison and is in the title "Arsenic and Old Lace."
bromide
Arsenic is used in rat poison and is in the title "Arsenic and Old Lace."
Arsenic is a common rat poison often found in mystery titles. Arsenic and Old Lace
bromadiolone is found in rat poisons