Eugeroic
Modafinil
A wakefulness-promoting compound used to enhance alertness and sustained cognitive performance.
KÖGN Health grades Modafinil as A+ (Strong evidence) and rates it 4.7 out of 5.
Last reviewed · June 2026
Primary effects
- Increased alertness
- Improved focus
- Reduced fatigue
- Sustained wakefulness
How it works
Modulates orexin and dopamine systems to promote wakefulness and prolonged cognitive endurance.
Overview
Modafinil is widely regarded as one of the most effective wakefulness-promoting agents available. It supports prolonged periods of cognitive performance without the typical crash associated with traditional stimulants. While highly effective, it is prescription-only in many regions and should be used responsibly due to potential side effects and individual variability in response.
The evidence
A prescription wakefulness agent (licensed for narcolepsy) that is also studied for cognitive enhancement. A widely cited 2015 systematic review concluded that in healthy, non-sleep-deprived people modafinil reliably improves attention, executive function and learning, with the clearest gains on complex or long tasks — though some studies note trade-offs in creativity or confidence. It is genuinely effective, which is exactly why it is controlled.
Safety & side effects
Common effects include headache, insomnia, anxiety, reduced appetite and raised heart rate. Rare but serious skin and hypersensitivity reactions (including Stevens-Johnson syndrome) are the reason it requires medical oversight.
Who should avoid it
Prescription-only — it should not be self-sourced or self-dosed, and is not a supplement. It reduces the effectiveness of hormonal contraception (including the pill), interacts with many medications, and is unsuitable in several heart and psychiatric conditions. Use only under the supervision of a qualified prescriber.
References
Related ingredients
Graded entries that target the same cognitive goals.
Categories
Draft — the dose, safety and evidence notes on this entry were prepared from the published literature and are pending editorial and clinical review.
Educational information, not medical advice. The evidence grade is KÖGN’s editorial assessment of published research, not a health claim. Speak to a qualified clinician before changing what you take.