Agomelatine (L()-Tartaric acid) is primarily used in the treatment of major depressive disorder (MDD) in adults. It functions as an antidepressant by acting as a melatonin receptor agonist and a serotonin receptor antagonist. This dual mechanism helps regulate circadian rhythms and improve mood, making it particularly effective for patients with disrupted sleep patterns associated with depression. It is often prescribed when other antidepressants have not been effective or are not well-tolerated. The addition of L()-Tartaric acid enhances the stability and bioavailability of the compound, ensuring better therapeutic outcomes. Patients typically take it orally, usually before bedtime, to align with its circadian rhythm-modulating effects.