Sorry my ignorance. Is that a lithium salt you have there bc lithium itself a metal and there would a strong reaction in your stomach if you swallowed the pure metal.
Lithium is prescribed (at least when I was on it) as a psych med primarily but not solely for bipolar disorder, and in that form it is a salt (and I apologize if I misunderstood the question and you already knew this!)
I can't comment on overdosing with it, but being on it was absolute hell for me (and I've heard similar from others), in part because I'd been prescribed an anti-psychotic for a NON-psychiatric disorder that has no real, directed treatment if its own (it's pretty much a, "Here are some off-label meds that MIGHT work, so let's just start throwing them at you until something sticks," thing), and I'm neurodivergent with paradoxical reactions (though at that time I was undiagnosed because the 80s, "girls don't get autism," etc), so not only was the original disorder not being helped by it, I also started suffering mental side effects due to how inappropiate a choice it was. But of course it wasn't that it was the wrong medication for my case, it was that I needed both a higher dose of it AND to start lithium for my newly-diagnosed bipolar disorder, despite lithium being STRONGLY contraindicated with the anti-psychotic...and I'm sure we all know the story from there. Didn't work, symptoms and mental state get worse, higher dose, even MORE new meds, wash rinse repeat. I'm absolutely sure that combination alone caused some of the damage I have now (and honestly, I never objected to the bipolar diagnosis the way my mother very vehemently did for reasons I don't understand, because *I* could see it, but I was also capable of realizing traditional treatment wasn't right for me, but had no say in it because I was a minor. Once I turned eighteen I cold-turkeyed off almost everything I was taking because even with the legal ability to say, "I do not want to continue this," my doctors wouldn't agree to let me come off (and you're not really supposed to do that, but I didn't have a choice) and started monitoring and managing my triggers myself in ways that DID work for me, and I was as close as I've ever been to sane for years (aside from the PTSD ¬_¬ ) until something else came along that messed me back up, but that's another Severely Long Story ("Thousands of years ago..!")
).
(Edited for some wrongly-placed punctuation OCD; actual content's still the same!)