Armodafinil: uses, dosing, side effects & brands
Armodafinil is a medicine sold in the U.S. under one brand, for sleep wake disorders. Below: what the FDA label says, every product that contains it, what the pills look like, and its recall record.
Key facts
- Treats
- Sleep Wake Disorders
- Available as
- Tablet
- Sold as
- Nuvigil
- Prescription?
- Prescription only
- Generic available?
- Not in our catalog
- What the pharmacy pays
- about $24 for a 30-count supply — not your price
How armodafinil is dosed
From the FDA label for Nuvigil (application NDA021875). Other armodafinil products — different forms, different strengths — are dosed differently. Follow the label for the one you were prescribed.
The recommended dosage of NUVIGIL for each indication is as follows: OSA or Narcolepsy: 150 mg to 250 mg once a day in the morning. ( 2.1 ) SWD: 150 mg once a day, taken approximately one hour prior to start of the work shift. ( 2.2 ) Hepatic Impairment: reduced dose in patients with severe hepatic impairment. ( 2.3 , 12.3 ) Geriatric Patients: consider lower dose. ( 2.4 , 12.3 ) 2.1 Dosage in Obstructive Sleep Apnea (OSA) and Narcolepsy The recommended dosage of NUVIGIL for patients with OSA or narcolepsy is 150 mg to 250 mg taken orally once a day as a single dose in the morning. In patients with OSA, doses up to 250 mg/day, given as a single dose, have been well tolerated, but there is no consistent evidence that these doses confer additional benefit beyond that of the 150 mg/day dose [see Clinical Pharmacology (12.3) and Clinical Studies (14.1, 14.2)] . 2.2 Dosage in Shift Work Disorder (SWD) The recommended dosage of NUVIGIL for patients with SWD is 150 mg taken orally once a day as a single dose approximately 1 hour prior to the start of their work shift. 2.3 Dosage Modification in Patients with Severe Hepatic Impairment In patients with severe hepatic impairment, the dosage of NUVIGIL should be reduced [see Use in Specific Populations ( 8.6 ) and Clinical Pharmacology ( 12.3 )]. 2.4 Use in Geriatric Patients Consideration should be given to the use of lower doses and…
Armodafinil side effects
The following serious adverse reactions are described below and elsewhere in the labeling: Serious Dermatologic Reactions [see Warnings and Precautions ( 5.1 )] Drug Reaction with Eosinophilia and System Symptoms (DRESS)/Multiorgan Hypersensitivity [see Warnings and Precautions ( 5.2 )] Angioedema and Anaphylaxis Reactions [see Warnings and Precautions ( 5.3 )] Persistent Sleepiness [see Warnings and Precautions ( 5.4 )] Psychiatric Symptoms [see Warnings and Precautions ( 5.5 )] Effects on Ability to Drive and Use Machinery [see Warnings and Precautions ( 5.6 )] Cardiovascular Events [see Warnings and Precautions ( 5.7 )] Most common adverse reactions (≥5%): headache, nausea, dizziness, and insomnia. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Apotex Corp. at 1-800-706-5575 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch . 6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. NUVIGIL has been evaluated for safety in over 1,100 patients with excessive sleepiness associated with OSA, SWD, and narcolepsy. Most Common Adverse Reactions In the placebo-controlled clinical trials, the most common adverse reactions (≥5%) associated…
Who shouldn’t take armodafinil
NUVIGIL is contraindicated in patients with known hypersensitivity to modafinil or armodafinil or its inactive ingredients [see Warnings and Precautions ( 5.1 , 5.2 , 5.3 )] . NUVIGIL is contraindicated in patients with known hypersensitivity to modafinil or armodafinil. ( 4 )
Armodafinil drug interactions
Effects of NUVIGIL on CYP3A4/5 Substrates The clearance of drugs that are substrates for CYP3A4/5 (e.g., steroidal contraceptives, cyclosporine, midazolam, and triazolam) may be increased by NUVIGIL via induction of metabolic enzymes, which results in lower systemic exposure. Dosage adjustment of these drugs should be considered when these drugs are used concomitantly with NUVIGIL [see Clinical Pharmacology (12.3)] . The effectiveness of steroidal contraceptives may be reduced when used with NUVIGIL and for one month after discontinuation of therapy. Alternative or concomitant methods of contraception are recommended for patients taking steroidal contraceptives (e.g., ethinyl estradiol) when treated concomitantly with NUVIGIL and for one month after discontinuation of NUVIGIL treatment. Blood levels of cyclosporine may be reduced when used with NUVIGIL. Monitoring of circulating cyclosporine concentrations and appropriate dosage adjustment for cyclosporine should be considered when used concomitantly with NUVIGIL. Effects of NUVIGIL on CYP2C19 Substrates Elimination of drugs that are substrates for CYP2C19 (e.g., phenytoin, diazepam, propranolol, omeprazole, and clomipramine) may be prolonged by NUVIGIL via inhibition of metabolic enzymes, with resultant higher systemic exposure. Dose reduction of these drugs may be required when these drugs are used concomitantly with NUVIGIL. Warfarin More frequent monitoring of prothrombin times/INR should be considered whenever NUVIGIL is coadministered with warfarin [see Clinical Pharmacology (12.3)] . Monoamine Oxidase (MAO) Inhibitors Caution should be used when concomitantly administering MAO inhibitors and NUVIGIL. Steroidal contraceptives (e.g., ethinyl estradiol): use alternative or concomitant methods of contraception while taking NUVIGIL and for one month after discontinuation of NUVIGIL treatment. ( 7 ) Cyclosporine: blood concentrations of cyclosporine may be reduced. ( 7 ) CYP2C19 substrates, such as omeprazole, phenytoin, and diazepam: exposure of these medications may be increased. ( 7 )
Every armodafinil product we track (1)
Same active ingredient — different manufacturer, form, price and FDA recall record. That last one is what our independent score measures.
Only one: Nuvigil.
What armodafinil pills look like
Imprint codes, colour and shape from the FDA’s labelling data. Match the imprint on your pill — or search any imprint.
| Imprint | Strength | Colour | Shape | Maker |
|---|---|---|---|---|
| K;59 | 150 mg | white | oval | — |
| 10;N | 200 mg | white | rectangle | — |
| M;A32 | 150 mg | white | round | — |
| C;205 | 50 mg | white | round | — |
| C;215 | 150 mg | white | oval | — |
| C;220 | 200 mg | white | rectangle | — |
| C;225 | 250 mg | white | oval | — |
| C;215 | 150 mg | white | oval | — |
| C;205 | 50 mg | white | round | — |
| C;220 | 200 mg | white | rectangle | — |
| C;225 | 250 mg | white | oval | — |
How long armodafinil keeps
No armodafinil label we read sets a separate limit for after opening, but they do specify how it must be stored — and the stability behind any date assumes those conditions.
Does armodafinil expire? The in-use limits and storage rules from its labelsArmodafinil and breastfeeding
From LactMed, the US National Library of Medicine’s Drugs and Lactation Database — quoted, not rewritten.
Full LactMed record for armodafinil: levels in milk, effects in breastfed infants, and the drugs it would consider insteadArmodafinil is the R-enantiomer of modafinil. Armodafinil has only been measured in the milk of mothers taking modafinil, where it is the predominant form, and its milk levels were extremely low. Some information from women who breastfed their infant's while using racemic modafinil found no adverse effects in their infants. Until more safety data are available, armodafinil should be used with careful infant monitoring during breastfeeding, or an alternate drug may be preferred.
National Institute of Child Health and Human Development, record revised April 15, 2025. LactMed states its information is not a substitute for professional judgement.
What people report to the FDA about armodafinil
The FDA Adverse Event Reporting System (FAERS) collects reports from patients and clinicians. It holds 3,677 reports naming armodafinil, and the FDA flagged 65% of those reports as serious. The effects reported most often — leaving out reports about overdose, misuse or the condition being treated, which dominate the raw list for common medicines:
- fatigue373 reports
- nausea309 reports
- headache277 reports
- anxiety250 reports
- somnolence243 reports
- dizziness212 reports
- depression198 reports
- fall191 reports
Read these as a signal, not a rate. A report does not mean armodafinil caused the effect — anyone can file one, and many describe people taking several medicines for several conditions. Crucially there is no denominator: FAERS does not record how many people took the drug, so these counts cannot be turned into “X% of patients” — a bigger number often just means a more widely used or more talked-about drug. Duplicates exist, and publicity drives reporting. For what is actually established, read the FDA label section above.
Source: openFDA drug/event (FAERS), retrieved July 25, 2026.
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Frequently asked questions
What is armodafinil?
NUVIGIL (armodafinil) is a wakefulness-promoting agent for oral administration. Armodafinil is the R-enantiomer of modafinil which is a 1:1 mixture of the R- and S-enantiomers.
Can you take armodafinil with other medicines?
It depends on the medicine. We check it against the FDA labels rather than guessing: our interaction checker searches each drug's own label for the other and quotes what it says, naming the section it came from. Run armodafinil against whatever else you take — and remember that a label not naming a drug is not the same as that combination being safe.
What forms does armodafinil come in?
Across the brands we track, armodafinil is currently marketed as tablet, per the FDA's National Drug Code Directory. Each form is dosed differently — follow the label for the exact product you were prescribed.
Is there a generic armodafinil?
We do not currently list a generic-labelled armodafinil product. That does not always mean none exists — it means none appears under a generic name in the FDA data we track. Ask your pharmacist.
Cite this page
- APA
- pharmaranks. (2026, July 24). Armodafinil: uses, dosing, side effects & brands. https://pharmaranks.com/drugs/armodafinil
- MLA
- “Armodafinil: uses, dosing, side effects & brands.” pharmaranks, 24 July 2026, https://pharmaranks.com/drugs/armodafinil.
We summarise public FDA and NIH sources — for a clinical claim, cite the primary source we link to as well.
Sources: FDA openFDA drug label, National Drug Code Directory, and Enforcement (recall) database. This page reproduces public FDA data and is not medical advice. Dosing is set by your prescriber.
Read the full FDA label for armodafinil on DailyMed (NIH) ↗.