I also became toxic on lithium. I was in a bad state and the pharmacy changed my pills from taking 2 600mg capsules to 1 1200mg capsule. I didn't read the bottle and took 2 of the 1200mg a day until I became so toxic I no longer knew my date of birth when they asked in the ER, couldn't walk unassisted, couldn't use a phone book (to call ER) or remember 911... I was on IV for 4 days in the psych unit. Even though I said I wasn't suicidal then moved me there from a medical ward. It was difficult because there were no call buttons so I couldn't call for help to go to the bathroom. Luckily, the second day my mom came and stayed with me, helping me to go to the bathroom. Toxicity is not fun.