Lithium is used to treat a number of mood disorders such as mania, hypomania and depression. It is also taken by many people long-term as a mood stabiliser to prevent such episodes. In a person with mania, their mood is very high, causing overactive and excitable behaviour; whereas people with depression have very low moods. Lithium is useful in a condition known as bipolar disorder, where there are extreme high and low moods. It is also used to treat some behavioural disorders, such as aggressive or self-harming behaviours.
This is a companion discussion topic for the original article at https://patient.info/medicine/lithium-tablets-and-liquid-medicine-camcolit-liskonum-priadel