Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Armodafinil | Ginkgo Biloba | |
|---|---|---|
| Category | Nootropics | Nootropics |
| Standard Dose | 75-150 mg once daily (for educational context only — prescription medication in most jurisdictions) | 120-240 mg/day of standardized extract (24% flavone glycosides, 6% terpene lactones) divided into 2-3 doses |
| Timing | Early morning. 150 mg armodafinil provides comparable late-day wakefulness to 200 mg modafinil. Food delays Tmax by ~2-4 hours but does not affect total absorption. Half-life approximately 15-16.5 hours. | With or without food. Split into 2-3 doses throughout the day. Effects may take 4-6 weeks to manifest. |
| Cycle Duration | Same as modafinil; not typically cycled in clinical use. | Ongoing; no cycling required. Clinical trials typically run 22-26 weeks. |
| Evidence Level | strong_human | strong_human |
The isolated R-enantiomer of racemic modafinil, sharing the same primary mechanism — selective inhibition of the dopamine transporter (DAT) — but with distinct pharmacokinetics. The R-enantiomer has a terminal half-life of ~15 hours vs. ~4-5 hours for the S-enantiomer, resulting in 33-40% higher plasma AUC compared to equimolar racemic modafinil. This translates to more sustained wakefulness-promoting activity throughout the day. Same downstream activation of orexinergic, histaminergic, and noradrenergic pathways as modafinil.
75-150 mg once daily (for educational context only — prescription medication in most jurisdictions)
Early morning. 150 mg armodafinil provides comparable late-day wakefulness to 200 mg modafinil. Food delays Tmax by ~2-4 hours but does not affect total absorption. Half-life approximately 15-16.5 hours.
Same as modafinil; not typically cycled in clinical use.
Standardized extract (EGb 761) contains flavonoid glycosides (24%) and terpene lactones (6% — ginkgolides A/B/C and bilobalide) that act through multiple pathways: potent free radical scavenging and inhibition of membrane lipid peroxidation; antagonism of platelet-activating factor (PAF) via ginkgolides; enhancement of cerebral blood flow through nitric oxide-mediated vasodilation and reduced blood viscosity; and increased prefrontal dopamine and acetylcholine release via acylated flavonol glycosides. Bilobalide provides direct neuroprotection against excitotoxicity and mitochondrial dysfunction.
120-240 mg/day of standardized extract (24% flavone glycosides, 6% terpene lactones) divided into 2-3 doses
With or without food. Split into 2-3 doses throughout the day. Effects may take 4-6 weeks to manifest.
Ongoing; no cycling required. Clinical trials typically run 22-26 weeks.
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