Lithium urate can calm guinea pigs injected with toxic urea.

“So what he basically was doing, again for you chemists, is he was taking uric acid, he was adding lithium, and making a solution of lithium urate. this is a lot of details, but this is important because what he eventually found is that when he diluted the uric acid with lithium and created lithium urate, lithium urate could actually calm down these guinea pigs that were injected with the toxic urea. He also found that lithium urate had a generally calming effect on these guinea pigs.”