Fasoracetam vs Oxiracetam

Mechanism

Non-classical racetam that modulates all three groups of metabotropic glutamate receptors (mGluR Groups I, II, and III) and upregulates GABA-B receptors — a unique mechanism that distinguishes it from other racetams. Also enhances high-affinity choline uptake (HACU) and stimulates acetylcholine release. Does not significantly affect adrenergic, serotonergic, or dopaminergic receptors. The GABA-B upregulation is particularly notable as it may counteract GABA-B receptor downregulation caused by phenibut or baclofen tolerance.

Standard Dosing

20-100 mg 1-3 times daily (sublingual or oral)

Timing

Morning and afternoon. Sublingual administration may provide faster onset and higher bioavailability. With or without food.

Cycle Duration

Cycles of 4-8 weeks on, 2-4 weeks off. Limited long-term safety data.

Side Effects

• Headache
• Fatigue
• GI discomfort
• Irritability
• Brain fog (paradoxical, at excessive doses)

Contraindications

• Known hypersensitivity to racetams
• Pregnancy and lactation (no safety data)
• Severe renal or hepatic impairment

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Mechanism

Modulates cholinergic neurotransmission by preventing scopolamine-induced decreases of acetylcholine in the hippocampus and cortex. Enhances D-aspartate release and modulates AMPA receptor activity. Demonstrates mild stimulatory properties without affecting dopaminergic or serotonergic systems, making it a 'cleaner' cognitive enhancer among racetams.

Standard Dosing

800-2400 mg/day divided into 2-3 doses

Timing

Morning and early afternoon; avoid evening dosing due to mild stimulatory effect. Can be taken with or without food (water-soluble).

Cycle Duration

Cycles of 8-12 weeks on, 4 weeks off

Side Effects

• Headache
• Insomnia
• Nervousness
• Nausea at high doses

Contraindications

• Severe renal impairment
• Known hypersensitivity to racetams

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