Aniracetam vs Piracetam

Mechanism

Potent positive allosteric modulator of AMPA receptors with 5-10x the potency of piracetam, slowing both channel closing rate and microscopic desensitization rates. Also modulates metabotropic glutamate receptors (mGluRs), activates nicotinic acetylcholine receptors, and indirectly boosts dopaminergic and serotonergic neurotransmission, conferring anxiolytic properties.

Standard Dosing

750-1500 mg/day divided into 2-3 doses

Timing

With fat-containing meals (fat-soluble compound; bioavailability increases significantly with dietary fat)

Cycle Duration

Cycles of 8-12 weeks on, 4 weeks off

Side Effects

• Headache (choline depletion)
• GI discomfort
• Restlessness
• Insomnia if taken late

Contraindications

• Severe hepatic impairment (hepatically metabolized)
• Known hypersensitivity to racetams

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Mechanism

Positive allosteric modulator of AMPA receptors, binding at a unique site along the dimer interface to reduce desensitization and deactivation. Inhibits N-type calcium channels at clinically relevant CNS concentrations. Enhances membrane fluidity of neuronal phospholipids and modulates neurotransmission across cholinergic and glutamatergic systems.

Standard Dosing

1200-4800 mg/day divided into 2-3 doses

Timing

With or without food; split doses morning and afternoon to maintain plasma levels

Cycle Duration

Cycles of 8-12 weeks on, 4 weeks off; or ongoing with periodic reassessment

Side Effects

• Headache (often from inadequate choline)
• Insomnia
• GI discomfort
• Irritability at high doses

Contraindications

• Severe renal impairment (renally excreted)
• Huntington's disease
• Cerebral hemorrhage

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