citalopram + lithium carbonate

Citalopram + lithium carbonate is a combination therapy of two pharmaceutical agents: **citalopram**, a selective serotonin reuptake inhibitor (SSRI) antidepressant, and **lithium carbonate**, a mood stabilizer primarily used in the treatment of bipolar disorder. This combination is generally used for **treatment-resistant major depressive disorder** and related mood disorders. Citalopram acts by inhibiting the serotonin transporter (solute carrier family 6 member 4, SLC6A4), increasing serotonergic activity in the central nervous system, which alleviates depressive symptoms. Lithium carbonate's precise mechanism in augmentation is not fully understood but is thought to involve modulation of neurotransmission, enhancement of serotonergic activity, and neuroprotective effects through second-messenger systems. Clinical studies have indicated that the addition of lithium to ongoing citalopram therapy can be effective for patients with depression unresponsive to citalopram alone[2][3][6].