Half-life
~12-15 hours.
Withdrawal timeline
Daytime sleepiness and fatigue return as the drug clears.
Tiredness, low energy, and sometimes low mood or difficulty concentrating are most noticeable here.
Energy and alertness re-baseline within a couple of weeks; the underlying sleep disorder persists.
Common symptoms
- Daytime sleepiness
- Fatigue
- Low energy
- Difficulty concentrating
Less common
- Low mood
- Irritability
- Headache
Tapering guidance
- A strict taper is usually not necessary; many patients stop directly, though stepping down after long-term use is reasonable.
- Coordinate with the prescribing physician, especially if it was used for a diagnosed sleep disorder.
Where ketamine therapy fits
Ketamine therapy does not treat modafinil discontinuation. It can be relevant when fatigue is driven by an underlying depression rather than a primary sleep disorder. Coordinate with the prescribing physician so the cause of the fatigue is correctly attributed.
Frequently asked questions
Does modafinil cause withdrawal?
It has low dependence potential and does not cause a classic stimulant withdrawal. Stopping mainly brings back sleepiness and fatigue, sometimes with brief low mood.
Do I need to taper modafinil?
Usually not, but a step-down after long-term use is reasonable. Coordinate with your prescriber, especially for a diagnosed sleep disorder.
Is modafinil compatible with ketamine therapy?
Generally yes, with coordination. They work through different mechanisms and 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.