Content reviewed by the PillRelax Healthcare Team | Last reviewed: September 2026

Modafinil is a prescription wakefulness-promoting medicine that has attracted significant interest beyond its licensed uses.

What Is Modafinil?

Modafinil is a eugeroic prescription medicine originally developed to treat narcolepsy. In the UK, it is licensed under the brand name Provigil and marketed as a generic.

Licensed Uses in the UK

Narcolepsy – reducing excessive daytime sleepiness
Obstructive sleep apnoea – adjunct to CPAP therapy
Shift work sleep disorder – maintaining wakefulness during night shifts

How Does Modafinil Work?

Modafinil inhibits dopamine reuptake and increases extracellular dopamine levels. Unlike amphetamines, it does not cause a significant dopamine release, which may explain its lower abuse potential. It also affects norepinephrine, serotonin, histamine, and orexin systems.

Legal Status in the UK

Modafinil is a prescription-only medicine (POM) but is not a controlled drug under the Misuse of Drugs Act 1971. It is legal to possess with a valid prescription.

Frequently Asked Questions

Can I get Modafinil on the NHS?

Yes – UK GPs can prescribe Modafinil for narcolepsy. Availability for other conditions varies by clinical need.

What is the difference between Modafinil and Armodafinil?

Armodafinil is the R-enantiomer of Modafinil with a longer duration of action and similar mechanism. Both require a prescription in the UK.