Lemon BalmvsTianeptine

Lemon balm inhibits GABA-transaminase (GABA-T), the enzyme that converts GABA to succinic semialdehyde in the GABA shunt, increasing GABA availability in synaptic terminals and producing anxiolytic effects via GABA-A (alpha2, alpha3 subunits) and GABA-B receptors. Rosmarinic acid provides antioxidant effects via Nrf2 activation and anti-inflammatory effects through COX-2 and NF-kB inhibition. Lemon balm inhibits acetylcholinesterase (AChE) at the catalytic site, mildly increasing acetylcholine in the hippocampus and cortex — explaining cognitive enhancement at moderate doses via muscarinic M1 and nicotinic receptor activation. At higher doses, GABAergic effects dominate, producing sedation useful for sleep. Additional mechanisms may include 5-HT2A antagonism and muscimol-like GABA-A modulation from trace constituents.

Tianeptine is a full agonist at mu-opioid (MOR) and delta-opioid (DOR) receptors, mediating both its antidepressant/anxiolytic effects and abuse potential at high doses. Paradoxically, it enhances serotonin reuptake via SERT—opposite to SSRIs—yet still produces antidepressant effects, possibly through opioid-mediated mood regulation. Tianeptine modulates glutamatergic signaling by reversing stress-induced downregulation of AMPA receptor subunits (GluA1/GluA2) and restoring synaptic plasticity. In the hippocampus and amygdala, it prevents stress-induced dendritic atrophy, spine loss, and CA3 pyramidal cell damage—likely through opioid receptor activation and downstream HPA axis effects. It increases BDNF levels and promotes neurogenesis. The combination of opioid agonism, glutamate normalization, and neuroplasticity enhancement underlies its unique profile.