Many different psychotropic medications can cause diarrhea, including SSRIs, SNRIs, lithium, valproate, etc. About 10% of patients on lithium develop diarrhea (Vestergaard et al., 1988). Among the mood stabilizers, lithium is more likely to cause diarrhea than valproate (Cipriani et al., 2013). While diarrhea due to mood stabilizers is usually benign, sometimes it can be…