Sunifiram: Potent in Mice, Never Tested in People
Sunifiram (DM235) came out of a University of Florence chemistry lab in 2000. In mice it blocked drug-induced amnesia at doses far below piracetam. Nobody has run a human trial.
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How Does Sunifiram Work?
A Florence team simplified a bicyclic nootropic scaffold into a series of acylpiperazines (J Med Chem 2000). Compound 13, DM235, was active in the mouse passive avoidance test at 0.001 mg/kg under the skin and raised acetylcholine release in rat brain. The authors described its profile as close to piracetam's, at much higher potency.
In 2003 the same group found that sunifiram (0.1 mg/kg i.p.) reversed amnesia caused by the AMPA blocker NBQX in mice. In rat hippocampal slices it reversed kynurenic acid's block of NMDA-driven noradrenaline release, and NBQX abolished that effect. They concluded AMPA signalling is part of how it works.
A Tohoku University team (Hippocampus 2013) found sunifiram enhanced long-term potentiation in mouse hippocampal slices at 10-100 nM, on a bell-shaped curve that peaked at 10 nM. A blocker of the NMDA receptor glycine site stopped the effect. The signal ran through Src, PKC-alpha and CaMKII.
Fulvio Gualtieri, who led the original group, wrote in 2016 that sunifiram was never patented. About 12 years after its disclosure he found dozens of websites selling it as a cognitive enhancer, though only a few preclinical studies existed and its long-term toxicity was unknown.
What the Data Shows
Key Takeaways
- Sunifiram was first reported in 2000 as compound 13 (DM235) in a series of piperazine derivatives, active at 0.001 mg/kg in a mouse memory test (PMID 11087574).
- In mice it prevented scopolamine-induced amnesia at 0.001-0.1 mg/kg i.p. and 0.01-0.1 mg/kg by mouth, an effect comparable to piracetam at 30-100 mg/kg i.p. (PMID 12070754).
- At those doses it did not impair motor coordination or change spontaneous movement in mice (PMID 12070754).
- It reversed amnesia caused by the AMPA receptor blocker NBQX, which points to AMPA signalling (PMID 14600801).
- In mouse hippocampal slices it boosted long-term potentiation at 10-100 nM, peaking at 10 nM, through the NMDA receptor glycine site (PMID 23733502).
- In olfactory-bulbectomized mice, 7-12 days of oral dosing improved spatial and object memory but did not improve depression-like behaviour (PMID 23295391).
- Any effect in people. ClinicalTrials.gov lists no study and PubMed holds no clinical paper.
- Long-term toxicity. The lead chemist wrote in 2016 that it was unknown (PMID 25831025).
- What it binds. Binding studies found no affinity for the most important central receptors or channels (PMID 16834757).
- A human dose. Mouse doses do not convert directly, and the slice data show a bell-shaped curve where a higher concentration did less.
- Half-life, oral bioavailability or metabolism. We found no pharmacokinetic study on PubMed.
- Whether research-chemical powders sold today match the compound used in the Florence studies.
Frequently Asked Questions
What is sunifiram?
Sunifiram (DM235) is a synthetic compound, 1-(4-benzoylpiperazin-1-yl)propan-1-one, made by a University of Florence group and first reported in 2000 (PMID 11087574). Its developers call it structurally related to piracetam, though it is built on a piperazine ring. It has no approved medical use and is sold online as a research chemical.
Is sunifiram a racetam?
Not strictly. Racetams such as piracetam share a 2-pyrrolidinone ring; sunifiram has an acylpiperazine instead. Its designers reported that this group can mimic the pyrrolidinone ring and that its effects in mice look much like piracetam's (PMID 11087574). A later paper from the group compares it to ampakines (PMID 14600801).
Is sunifiram stronger than piracetam?
It is more potent, meaning far smaller doses worked in mice. The 2002 study put its potency about 1,000 times above the most active piracetam-like compounds, while the size of the anti-amnesia effect was comparable to piracetam (PMID 12070754). A 2006 review described it as four orders of magnitude more potent than piracetam (PMID 16834757).
Has sunifiram been tested in humans?
No. PubMed holds no clinical study and ClinicalTrials.gov lists no registered trial as of November 2026. Fulvio Gualtieri, who led the original academic group, wrote in 2016 that websites were selling it and its sister nootropic unifiram even though only a few preclinical studies existed and their long-term toxicity was unknown (PMID 25831025).
How does sunifiram work?
The mechanism is only partly mapped, and all of it comes from animal tissue. Studies point to AMPA receptor signalling (PMID 14600801) and the glycine site of the NMDA receptor, with downstream PKC-alpha and CaMKII activation (PMID 23733502). It also raised acetylcholine release in rat brain (PMID 11087574), though a binding screen found no affinity for the main central receptors or channels (PMID 16834757).
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