Half-life
~15 hours. Armodafinil is the longer-lasting R-enantiomer of modafinil.
Withdrawal timeline
Daytime sleepiness returns as levels fall.
Fatigue, low energy, and occasionally low mood are most noticeable.
Alertness re-baselines within a couple of weeks; the underlying condition persists.
Common symptoms
- Daytime sleepiness
- Fatigue
- Low energy
- Difficulty concentrating
Less common
- Low mood
- Irritability
- Headache
Tapering guidance
- A strict taper is usually not needed; stepping down after long-term use is reasonable.
- Coordinate with the prescribing physician.
Where ketamine therapy fits
Ketamine therapy does not treat armodafinil discontinuation. As with modafinil, it can be relevant when fatigue stems from an underlying depression. Coordinate with the prescribing physician.
Frequently asked questions
Does Nuvigil cause withdrawal?
It has low dependence potential. Stopping mainly returns sleepiness and fatigue, sometimes with brief low mood, rather than a classic withdrawal syndrome.
Is armodafinil different from modafinil when stopping?
They are very similar. Armodafinil lasts a bit longer, but the discontinuation experience - mild return of sleepiness - is comparable.
Can I combine Nuvigil with ketamine therapy?
Generally yes, with coordination. There is no required washout.
Important: This page is informational and does not constitute medical advice or a recommendation to start, stop, or change any medication. Tapering psychiatric medications should always be coordinated with the prescribing physician. Compounded ketamine for anxiety, depression, PTSD, and chronic pain is not FDA approved.
Browse all medication withdrawal guides.