Breakthrough sensor to help people with bipolar disorder monitor lithium levels -- ScienceDailyithium is an antipsychotic drug used to treat mood conditions such as bipolar disorder and depression. The drug must be carefully monitored when given to patients, as the wrong dose could prove to be highly toxic. Lithium levels initially need to be checked five to seven days after the first dose, followed by weekly checks until levels stabilise between two doses -- after which levels are typically monitored every three months. The new miniature sensors were shown to quickly and accurately detect lithium concentration levels -- from clinically effective, to toxic concentration limits. The sensor is able to detect lithium concentration in the blood even if there is a high concentration of sodium.