Modafinil, Armodafinil and Adrafinil: Prescription Status and Risks

This page is information only. It does not recommend these substances, suggest amounts or explain how to get them. A prescriber decides whether a medicine is right for a person. Never start, stop or change a prescribed medicine without talking to the prescriber.

Prescription status by country (what we could read)

Rules change; this is a snapshot of pages read on 2026-10-23.

The UK government's drug advisers invited evidence in 2020 on non-medical use of modafinil, methylphenidate and dexamfetamine, which they called "cognition enhancers" [11].

What does research show for healthy people?

Evidence labels used here: "mixed" and "insufficient evidence". People with narcolepsy, sleep-deprived workers and healthy rested students are different groups, so results do not transfer between them.

• Healthy, not sleep-deprived adults: mixed, small effects. A 2020 set of meta-analyses (47 studies across three drugs) found an overall effect of modafinil on cognitive tasks of SMD 0.12 [12]. The authors wrote that data on these stimulants is far from positive, and that a user perception of effectiveness is not supported by the evidence so far [12].
• Systematic review. A 2015 review found that most studies using basic tests showed some benefit for executive function, but only half showed improvements in attention and learning and memory, and a few reported impairments in divergent creative thinking [13]. It also noted methodological discrepancies across the literature [13].
• Short laboratory tasks are not the same as everyday school or work performance.

Risks (from the sources we read)

• Habit-forming. MedlinePlus says modafinil may be habit-forming [1] and armodafinil may be habit forming [2]. It also says modafinil should not be used in place of getting enough sleep [1].
• Serious reactions. MedlinePlus lists rash, blisters, chest pain, fast or irregular heartbeat, hallucinations, anxiety, depression and thinking about harming yourself as reasons to call a doctor immediately [1]. The MHRA likewise listed psychiatric disorders, serious skin reactions and cardiovascular disorders [8]. If you are in crisis in the US, call or text 988.
• Heart, liver, kidney, mental health history. MedlinePlus says to tell the doctor about heart, liver or kidney disease and mental illness [1].
• Pregnancy and contraception. The MHRA reported an approximate 15% likelihood of birth defects when modafinil is taken in pregnancy, compared with 3% in the general population, and said it can reduce the effectiveness of many hormonal contraceptives [8]. MedlinePlus says to tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding [1]. See Pregnancy and Breastfeeding.
• Interactions and surgery. MedlinePlus names omeprazole as an example that may interact [1] and asks you to tell any surgeon or dentist you take modafinil [1]. See Medication Interactions.
• Driving. MedlinePlus says not to drive or operate machinery until you know how the medicine affects you [1].
• Buying without a prescription. The MHRA warned that a huge number of medicines bought online are counterfeit, substandard or adulterated [14]. Products sold outside the prescription system may not contain what the label says.
• Overdose. MedlinePlus says to call poison control at 1-800-222-1222 [1]. In an emergency call 911.
• Children and older adults: not covered in the sources we read; ask the prescriber.

Adrafinil

Adrafinil is described in a research paper as a vigilance-promoting agent of the same pharmacological class as modafinil, with a first reported case of abnormal mouth and face movements (dyskinesia) that did not recover for 4 months after it was stopped [15]. A forensic paper says it is primarily metabolized in the body to modafinil [16], and that the World Anti-Doping Agency banned both in sport in 2004 [16]. We found no regulator page on adrafinil to read. A US Drugs@FDA search returned no match [5], and we make no legal claim beyond that. Proper evidence not found for adrafinil as a safe cognitive aid; we searched PubMed for "adrafinil".

If you are thinking about it

If sleepiness or poor focus is the problem, a clinician can look for causes such as sleep apnea, medicines or ADHD; see Sleep Safety and When to Get Help and ADHD in Adults. For students and workplaces, see Non-Prescribed Stimulant Use in Students and Workplaces.