This may be my first Italian bottle, not so much a sodium bromide, probably more of a citrate of magnezia looks like they still sell it today. I bought it more for it's bromo form and being a monster 9 inches tall!
Not of magnesia but something for an antacid rather than a laxative. Citrate takes many forms and that should fit in nicely with your bromo collection. Plus it's effervescent.[]