Quick Comparison
| Agmatine Sulfate | Tianeptine | |
|---|---|---|
| Half-Life | 2-3 hours | 2.5-3 hours (tianeptine), 7-8 hours (active metabolite MC5) |
| Typical Dosage | Standard: 500-2000 mg daily in 1-3 doses. For mood: 1000-2000 mg. For pain: 1000-2500 mg. Take on empty stomach. Agmatine sulfate is the most common supplement form. May enhance the effects of some nootropics and medications — research interactions. | Prescription dose: 12.5 mg three times daily (Stablon). Extended-release: 25 mg once daily (Tianeurax). Do not exceed prescribed doses — abuse potential at higher doses due to opioid activity. |
| Administration | Oral (powder, capsules). Take on empty stomach for best absorption. | Oral (tablets). Immediate-release (12.5 mg TID) or extended-release (25 mg QD). |
| Research Papers | 10 papers | 10 papers |
| Categories |
Mechanism of Action
Agmatine Sulfate
Agmatine is a polyamine neuromodulator with multiple targets: (1) NMDA receptor antagonist at the polyamine binding site (GluN1/GluN2B) — reduces excitotoxicity, pain signaling, and blocks the receptor's open channel. (2) Imidazoline I1 and I2 receptor agonist — I1 in the rostral ventrolateral medulla reduces sympathetic tone; I2 modulates monoamine oxidase and provides anxiolytic/antidepressant effects. (3) Selective nNOS (neuronal nitric oxide synthase) inhibitor — reduces peroxynitrite formation and oxidative stress while preserving eNOS (endothelial) function for vascular health. (4) Alpha-2 adrenergic receptor agonist — reduces norepinephrine release from locus coeruleus, promoting calm. (5) Modulates opioid receptors — enhances mu-opioid analgesia, potentiates delta-opioid, and may reduce tolerance via nitric oxide and NMDA mechanisms.
Tianeptine
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.
Risks & Safety
Agmatine Sulfate
Common
Mild gastrointestinal discomfort, diarrhea at high doses.
Serious
May potentiate opioid medications (increased sedation risk). May lower blood pressure.
Rare
Headache, nausea.
Tianeptine
Common
Nausea, constipation, abdominal pain, headache, dizziness, dry mouth.
Serious
Opioid-like effects at high doses (euphoria, dependence, respiratory depression). Withdrawal syndrome with abrupt cessation after chronic high-dose use. Abuse and overdose deaths reported.
Rare
Hepatotoxicity, skin reactions.
Full Profiles
Agmatine Sulfate →
A metabolite of L-arginine produced by decarboxylation. Agmatine is an endogenous neuromodulator that acts on multiple receptor systems — it blocks NMDA receptors, activates imidazoline receptors, inhibits nitric oxide synthase, and modulates opioid signaling. This makes it useful for neuropathic pain, mood, stress resilience, and as a complement to other nootropics. Also enhances insulin sensitivity and nitric oxide production.
Tianeptine →
An atypical antidepressant with unique nootropic properties. Unlike SSRIs which increase serotonin, tianeptine is a mu-opioid receptor agonist and enhances serotonin reuptake. It reduces stress-induced neuronal damage in the hippocampus and amygdala, improving mood, cognition, and stress resilience simultaneously. Prescription medication in many countries but carries abuse potential at high doses.