Coluracetam
Coluracetam
Coluracetam (BCI-540) is a high-affinity choline uptake (HACU) enhancer belonging to the racetam family, originally developed by Mitsubishi Tanabe Pharma and later investigated for major depressive disorder and anxiety. It is primarily used by nootropic enthusiasts to enhance memory consolidation, improve focus, and potentially support mood, with early clinical trials suggesting benefit in treatment-resistant depression with comorbid anxiety.
Mechanism of Action
Coluracetam potently enhances the high-affinity choline uptake (HACU) system in neurons, increasing the transport of choline into presynaptic terminals where it is converted to acetylcholine, thereby boosting cholinergic neurotransmission. Unlike acetylcholinesterase inhibitors, it works upstream at the choline transporter level, which may produce a more physiologically regulated increase in acetylcholine. It may also modulate AMPA receptor kinetics similarly to other racetams, contributing to enhanced synaptic plasticity and cognitive function.
Evidence by Health Goal(2 goals)
Dosing Protocols
With a fat-containing meal to enhance absorption
Cycle: 5 days on, 2 days off, or 4 weeks on, 2 weeks off
Start at 10mg to assess sensitivity. Doses above 35mg rarely provide additional benefit and increase side effect risk. Lipid-soluble compound — fat co-ingestion significantly improves bioavailability.
Hold under tongue for 60-90 seconds before swallowing
Cycle: 5 days on, 2 days off
Sublingual route may provide faster onset and higher effective bioavailability at lower doses. Often dissolved in a small amount of oil or alcohol solution. Bitter taste is common.
Safety & Side Effects
Coluracetam has a limited human clinical trial record but demonstrated acceptable tolerability in phase 2a trials at doses up to 240mg/day; at typical nootropic doses (10-35mg), it appears well-tolerated in healthy adults. It is not FDA-approved, exists in a legal gray area in most countries, and long-term safety data in humans is largely absent — caution is warranted for chronic use.
Possible Side Effects
- !Headache, particularly without adequate choline intake
- !Brain fog or mental fatigue, especially with excessive cholinergic stimulation
- !Nausea at higher doses (above 25-35mg)
- !Irritability or emotional blunting with overuse
- !Fatigue or lethargy following the acute effects
- !Vivid dreams or disrupted sleep if taken in the afternoon or evening
- !Gastrointestinal discomfort including loose stools at high doses
Interactions
- -May potentiate the effects of cholinergic drugs (e.g., acetylcholinesterase inhibitors like donepezil or huperzine A), risking cholinergic excess symptoms such as nausea and bradycardia
- -Additive cognitive effects possible when combined with other racetams; monitor for overstimulation or increased headache risk
- -May theoretically interact with anticholinergic medications (e.g., diphenhydramine, scopolamine) by opposing their mechanism, reducing efficacy of either agent
- -Combined use with high-dose choline supplements (e.g., alpha-GPC, CDP-choline) may cause excessive cholinergic tone — start choline supplementation at low doses
- -No established interactions with SSRIs/SNRIs, though caution is advised given its investigation in mood disorders and the potential for pharmacodynamic interaction
Cost & Where to Buy
Sold primarily as a research chemical or nootropic supplement; price varies significantly by vendor purity and form (powder vs. capsule). Powder form is cheapest; at 20mg/day the monthly cost is modest, but quality control across vendors is inconsistent.
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