NSI-189
NSI-189
NSI-189 is a synthetic benzylpiperazine-aminopyridine compound originally developed by Neuralstem Inc. as a potential treatment for major depressive disorder and cognitive impairment. It is used off-label in the nootropic community for its purported neurogenic, antidepressant, and cognitive-enhancing properties. Clinical trials have explored its effects on hippocampal neurogenesis and depressive symptoms, though it has not received FDA approval.
Mechanism of Action
NSI-189 is believed to stimulate neurogenesis in the hippocampus, increasing hippocampal volume and potentially reversing stress-induced atrophy, though its precise molecular target remains uncharacterized. Preclinical data suggest it may activate signaling pathways related to BDNF and promote proliferation of human hippocampal stem cells. It does not appear to act primarily via classical monoaminergic mechanisms, distinguishing it from conventional antidepressants.
Evidence by Health Goal(8 goals)
Dosing Protocols
Morning, with or without food
Cycle: 8 weeks on, 4 weeks off
The 40mg once-daily dose was used in Phase 1/2 clinical trials and is the most commonly referenced dose. Some self-experimenters use split dosing (e.g., 20mg twice daily). Doses above 40mg/day have not demonstrated additional benefit and may increase side effects.
Morning and early afternoon
Cycle: 8 weeks on, 4 weeks off
Split dosing may reduce peak-related cognitive side effects such as mental fog or emotional blunting. Avoid late-afternoon dosing to minimize potential sleep disruption.
Safety & Side Effects
NSI-189 has completed Phase 1 and Phase 2 clinical trials with a generally tolerable short-term safety profile at 40mg/day, but long-term safety data are limited and it is not an approved drug. Users should exercise caution given the lack of regulatory oversight in the research chemical market, unknown long-term neurological effects, and significant individual variability in response; those with psychiatric conditions should consult a physician before use.
Possible Side Effects
- !Headache, particularly during initial weeks of use
- !Emotional blunting or flattened affect reported by some users
- !Cognitive fog or reduced mental clarity, paradoxically occurring in some individuals
- !Fatigue or low energy, especially in early stages
- !Increased anxiety or emotional lability in a subset of users
- !Vivid or unusual dreams
- !Mild gastrointestinal discomfort including nausea
Interactions
- -May have additive effects with other antidepressants (SSRIs, SNRIs, MAOIs) - combination not studied and could increase risk of adverse mood effects
- -Potential additive neurogenic effects with Lion's Mane mushroom (Hericium erinaceus) - clinical significance unknown
- -May interact with CNS stimulants (amphetamines, modafinil), potentially altering cognitive or mood effects unpredictably
- -Caution advised in individuals taking anticonvulsants due to theoretical effects on hippocampal activity
- -No established interactions with common supplements, but limited pharmacokinetic data exist
Cost & Where to Buy
Available from research chemical and nootropic vendors; price varies significantly by vendor, purity certification, and batch size. Third-party lab testing (COA) should be prioritized when purchasing, which may increase cost. No prescription is currently required in most jurisdictions.
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