Drooling mouth: A rare complication of oral lithium therapy at subtherapeutic level

Medications for bipolar affective disorder and unipolar depression frequently involve the use of lithium, a mood stabilizer. Because of its limited therapeutic window, regular monitoring of serum lithium levels and clinical assessment is crucial. Sialorrhea, terminology used for hypersalivation or excessive drooling, is a common complication of many psychotropic medications but has rarely been noticed as a side effect in patients on oral lithium therapy. Here, we present a case of recurrent depressive disorder that developed sialorrhea after 6 months of taking lithium at a subtherapeutic level.