Nefiracetam

As a racetam-class nootropic, nefiracetam is by far the most controversial and mysterious. Developed by Japan-based pharmaceutical company Daiichi Seiyaku in late 1990s While several of its mechanisms of action have been identified, and research speaks in favor of its potency, its popularity remains limited due to safety concerns, whose validity has not been determined.

Nefiracetam’s effects are mediated through multiple pathways. It is known to support high-affinity choline uptake (HACU), increasing acetylcholine availability. Additionally, it modulates nicotinic acetylcholine receptors (nAChRs), particularly the α7 and α4β2 subtypes, critical for memory and attention.

Much of nefiracetam’s pro-cognitive effects are realized by the interplay of its robust glutamatergic mechanisms. It has been found to enhance NMDA and AMPA receptor function, improving synaptic plasticity and long-term potentiation (LTP). Nefiracetam further facilitates LTP through neuronal calcium channel currents modulation, specifically by enhancing the long-lasting component of L-and N-type calcium channels, vital to memory formation. Additionally, nefiracetam stimulates the activity of protein kinase C alpha (PKCα), a key factor in LTP, and correspondingly, Ca2+/calmodulin-dependent protein kinase II (CaMKII), which is essential for memory consolidation, both enzymes being glutamate dependent. Interestingly enough, CaMKII potentiation is likely responsible for nefiracetam’s anti-depressant effects observed in a Japanese mice study. Mice with depressive-like behavior received 1 mg/kg of nefiracetam per day, and improvement was noted within a single day of administration.

These glutamatergic mechanisms are, however, unlikely to result in overstimulation, given that nefiracetam shows high affinity for GABA-A receptor, where it is thought to act as an agonist. That said, there is a nuance to its GABA-ergic action, as it only enhances signaling on GABA-A receptor when GABA is too low. Conversely, it has been found to exhibit a suppressing effect when excess GABA is present. Owing to these complementary mechanisms, it reduces anxiety without sedation, which probably amounts to focus enhancement observed with this compound, and could by why its users often report increased sociability and greatly reduced (if not absent) mood swings. By ensuring and maintaining optimal stimulation level, nefiracetam could potentially boost productivity, as task persistence might come naturally and relatively effortless in the sweet spot between boredom and overwhelm.

Furthermore, nefiracetam has been shown to influence dopamine and norepinephrine pathways, which may explain its pro-motivational effects. It might upregulate brain-derived neurotrophic factor, facilitating neurogenesis. Neuroprotective properties of nefiracetam stem from its anti-oxidant, and anti-inflammatory activity; in addition to that, it could potentially prevent excitotixicty by promoting healthy glutamate/GABA balance. The latter is thought to explain its ability to prevent seizures demonstrated in animal studies.

Preliminary research indicates that nefiracetam might improve intellectual ability, motivation and apathy following stroke. As evidenced in rodent studies, it corrects the impairment of local cerebral blood flow and glucose utilization after chronic focal cerebral ischemia. While certain studies suggest that Nefiracetam may inhibit β-amyloid toxicity implicated in Alzheimer’s Disease, others support the hypothesis of its antiamnesic activity in this condition; it is likely to offer comparable benefits in cerebrovascular dementia.

There is, however, one finding that makes it unique as a nootropic: it has been shown to accelerate remyelination. Nefiracetam’s potential to promote myelin repair and neuroprotection makes it a candidate for repositioning in MS and other conditions involving nerve damage or demyelination. One of particular promise given the fact that unlike current drugs that address the symptoms, nefiracetam might offer a take on causal treatment. It can be speculated that by virtue of this effect, nefiracetam could potentially improve motor coordination in individuals with autism spectrum disorder.

Benefits of taking nefiracetam

• enhanced memory and learning;

• improved focus and concentration (sustained and smooth);

• reduced anxiety;

• anti-depressant effects;

• increased verbal fluency;

• greater task persistence;

• boost in motivation;

• emotional stability;

• increased sociability;

• greater mental stamina;

• enhanced visual acuity;

• alleviates brain fog;

• anti-oxidant;

• protection against excitotoxicity;

• myelin repair.

Side effects

• anxiety;

• fatigue;

• headaches;

• nervousness;

• nausea;

• kidney pain (potentially dangerous, must be discontinued!).

Interactions

• CNS stimulants (some individuals might experience over-stimulation);

• anticholinergics (reduced cognitive benefits);

• benzodiazepines (additive sedation possible, but not very likely);

• CYP3A4 inhibitors: apigenin, grapefruit juice, etc. (could lead to increased plasma concentrations of nefiracetam).

Contraindications and safety concerns

Individuals with kidney or liver disease are strongly advised to refrain from taking nefiracetam.

While long-term studies have found no proof of nefiracetam’s toxicity in humans and primates in general, it has been determined that certain species (dogs in particular) are at risk for renal and testicular toxicity due to metabolic differences.

It is believed to be caused by a specific metabolite of nefiracetam, M-18 which isn’t formed in humans. That said, anecdotal reports suggest that some people experience kidney pain or notice initial signs of renal impairment within a few weeks of its daily use, which improve shortly upon its discontinuation.

The root cause of this effect remains unknown. One hypothetical explanation postulates that it cannot be stated with absolute certainty that the aforementioned toxic metabolite of nefiracetam is absent in humans because it hasn’t been studied outside the Japanese population, where the incidence of CYP3A4 (main enzyme responsible for nefiracetam breakdown, present in greater amounts in dogs) ultra-rapid metabolizers is lower than in certain ethnic groups. Alternatively, nefiracetam might be nephrotoxic to genetically predisposed individuals due to its anti-inflammatory action, given that inhibition of prostaglandin synthesis can cause decreased glomerular filtration rate, which in turn results in adverse renal effects, including acute kidney injury, hyperkalemia, hypertension, and edema.

Dosage

Typical nefiracetam dose is 150-450 mg per day, usually split into two doses. As a fat soluble compound, it is best absorbed when ingested with a meal rich in fats.

While it might take days to weeks to experience a wide range of its effects, acute cognitive benefits of nefiracetam are often noted within 1-2 hours.