Tianeptine acts by -
Mechanism of action of important atypical antipsychotics 

Tianeptine & amineptine   → Serotonin uptake enhancer
Trazodone                           → α-blocking & weak 5-HT antagonistic action.
Venalafaxine & Duloxetine → serotonin and noradrenaline reuptake inhibitor (SNRI).
MAO inhibitor
Serotonin uptake inhibitor
Serotonin uptake enhancer
5-HT agonist