Any info on what this small bottle might have contained?

[Aqua eater]

Cleaned up really nice, I’m not too sure on its age so I hope I didn’t post it in the wrong forum. The seam is very faint and stops just where the lip starts. It’s 3 3/8 of an inch tall, and 7/8 of an inch in base diameter.

 

[CanadianBottles]

Probably some sort of medicine but impossible to say what. The bottle looks European to me.