Informational only. Not medical advice.INFORMATIONAL PLATFORM ONLY — NOT MEDICAL ADVICE, DIAGNOSIS, OR TREATMENT
Informational only. Not medical advice.INFORMATIONAL PLATFORM ONLY — NOT MEDICAL ADVICE, DIAGNOSIS, OR TREATMENT
Head-to-head comparison of Aniracetam and ISRIB — mechanism, side effects, legal status, and pricing.
Aniracetam is a non-peptide pyrrolidinone derivative and positive allosteric modulator of AMPA-type glutamate receptors. It is marketed as a prescription drug for cognitive disorders in some European countries (Italy, Greece) but has never been approved by the US FDA as either a drug or dietary supplement ingredient. The compound was reportedly withdrawn from the Japanese market following a failed confirmatory trial. Despite lacking US regulatory approval, aniracetam is openly sold online by nootropic-supplement retailers, often with significant label-accuracy problems.
ISRIB is a non-peptide small-molecule eIF2B activator (bis-chlorophenoxyacetamide-cyclohexane class) that antagonizes the integrated stress response (ISR) by stabilizing the eIF2B guanine-nucleotide exchange factor complex. It is not an approved drug and has no completed human clinical trials or validated human safety or efficacy data. Chemically distinct eIF2B-activator analogs (DNL343, ABBV-CLS-7262) have reached human trials, but DNL343 missed primary endpoints in a Phase 2/3 ALS trial (January 2025). ISRIB is sold by reagent suppliers for research use only.
Aniracetam
ISRIB
Category
Legal Status
Mechanism
Side Effects
COA-verified vendors · trust score ≥70 required · single-vial price — bulk/bundle deals may be lower
Aniracetam
No pricing data yet.
Check Aniracetam prices →ISRIB
COA corpus from Disclosed Labs — independently tested batches only.
Aniracetam
2
COAs
99.5%
Avg purity
2
Labs
ISRIB
1
COAs
99.8%
Avg purity
1
Labs
The principal human efficacy evidence is one 6-month, double-blind, placebo-controlled multicenter trial in 109 elderly patients meeting probable-Alzheimer's criteria, which showed significant improvement in psychobehavioral parameters versus placebo with excellent reported tolerability, though no itemized adverse-event breakdown was available. No long-term (multi-year) human safety data were located, and no interventional trials of aniracetam are currently registered on ClinicalTrials.gov. In rodent models, aniracetam (50 mg/kg/day for 10 postnatal days) reversed prenatal-ethanol-induced avoidance-learning deficits in rat offspring and increased AMPA-receptor-mediated synaptic currents in hippocampal CA1 pyramidal cells. However, oral aniracetam (50 mg/kg, 5 days/week for 6 weeks) produced no cognitive or behavioral enhancement in healthy adult C57BL/6J mice across a comprehensive test battery.
Key references
No completed or published human clinical trials of ISRIB itself exist; it has no validated human pharmacokinetic, safety, or efficacy data. In mice, systemic ISRIB enhanced spatial and fear-associated long-term memory in healthy animals, reversed hippocampus-dependent spatial-learning and working-memory deficits weeks after traumatic brain injury, and reset elevated ISR activity in aged (18–24 month) mice, reversing age-related spatial-memory decline with a brief 3-day dosing course. In prion-disease transgenic mice, ISRIB partially restored protein synthesis and prevented neurodegeneration without the pancreatic exocrine toxicity seen with PERK-inhibitor approaches. In vitro and in a patient-derived xenograft mouse model, ISRIB combined with imatinib attenuated RAS/RAF/MAPK and STAT5 signaling and eliminated therapy-resistant chronic myeloid leukemia cells.
Aniracetam and ISRIB are both in the Cognitive category and may have overlapping mechanisms. Researchers should review both profiles carefully, understand the mechanisms of action, and monitor the relevant biomarkers when combining compounds in the same class. As always, consult a licensed healthcare provider before making any decisions about combining research compounds.
This platform provides informational tools only, not medical advice. This comparison is for educational purposes only. Consult a licensed provider.
Contraindications
Lab Testing
Key references
Disclosed Labs