Counterfeit modafinil: what regulators and labs have found

Key points

• Regulators warn in general terms that medicines from illegitimate online sellers can contain the wrong ingredient, too much or too little of the right one, or none [5][6]. Only one MHRA release we opened names modafinil [1].
• We found two peer-reviewed laboratory papers on modafinil tablets obtained online. Neither is a survey of counterfeit rates: one is a method study of 8 batches, the other a forensic report on 5 tablets [7][8].
• Official customs statistics we could open do not break out modafinil. Swissmedic’s 2024 figures put sleeping tablets, tranquillisers and similar products at 10% of 5,668 seized consignments [4].
• A product offered openly online is not evidence that it is legal, authentic or what the label says. Regulators remove such listings in the hundreds and thousands [1][3].
• No figure for how much “modafinil” sold online is counterfeit exists in the sources we could verify.

This article is information, not legal advice. All sources were read on 8 November 2026 unless another date is given. Legal status by country is in modafinil legal status by country; medical effects are in modafinil side effects and interactions.

What “counterfeit” and “unregulated” mean here

A counterfeit medicine is one deliberately and fraudulently mislabelled as to identity or source. Assi and colleagues, citing the WHO, use that definition and separate it from “degraded” medicines (spoiled by storage) and “substandard” ones (accidental manufacturing defects) [7]. The three have different causes but are hard to tell apart without a laboratory, and the studies below do not always distinguish them.

“Unregulated” is wider: a product that no regulator has authorised for that market, made under no inspection we can verify, and sold without a prescription. A tablet can be unregulated and still contain what the label says. The reverse is also possible. Nothing in the sources lets us say how often each occurs for modafinil.

Regulatory status

Modafinil is a prescription medicine in the jurisdictions we checked, and a Schedule IV controlled substance in the United States. The details, with sources and the places we could not verify, are in the legal status article; we did not re-check them here. We did not examine the EU, German or Swiss registers for this article, and the Australian TGA pages timed out on every attempt, so TGA statements are “not verified”. “Research use only” labelling is not a regulatory category for modafinil and plays no role in the sources below.

What regulators have published

MHRA (UK), 26 September 2016. A release aimed at students said modafinil “is licensed for specific medical conditions” and not as an exam aid. It reported nearly 5,000 websites selling fake or unlicensed medicines shut down that year, and that during Operation Pangea the agency seized more than 31,000 doses of narcolepsy medication. It listed dependence, cardiovascular problems and psychosis as risks of misusing “cognitive enhancers”. The release does not say how much of the seized medication was modafinil, and it does not report laboratory results [1].

MHRA, 25 June 2025. For Pangea operations between December 2024 and May 2025 the agency reported 7.7 million doses of illicit medicines seized (estimated value 17.2 million pounds) and 367 websites and social media accounts removed. The seizures were described as prescription-only medicines such as strong painkillers, antidepressants and sleeping pills. The page does not mention modafinil [3]. An MHRA official warned that some products “can contain dangerous or illegal ingredients” [3].

Danish Medicines Agency, 7 May 2026. Reporting on Operation Pangea XVIII (10 to 23 March 2026, 90 countries and territories), it gave Interpol’s totals: 269 arrests, 66 criminal groups dismantled, and 6.42 million doses of unauthorised and falsified medicines seized, worth USD 15.5 million. The most frequently seized product groups were erectile dysfunction medicines, sedatives, painkillers, antibiotics and smoking-cessation products. Denmark itself reported six websites to the police, including for unauthorised ADHD medicines, and detained 19 customs consignments, mostly narcotics. Modafinil is not named [2].

Health Canada, page dated 23 October 2026. The page lists what illegitimate online sellers may supply: expired drugs, drugs with dangerous additives, “the wrong ingredients”, “counterfeit drugs with no active ingredients”, and drugs contaminated with other drugs, including prescription or controlled ones. It does not mention modafinil [5].

FDA, consumer update (page current as of 01/02/2025, as printed). Products from unsafe online pharmacies may have “too much or too little of the active ingredient” or “not contain the right active ingredient”, may hold “other harmful substances”, and an unidentified ingredient could interact with other medicines. The page is general and does not name modafinil [6].

Not verified. We could not open the Interpol news pages (HTTP 403), the Europol Pangea page (it returned only a title), or the TGA pages on modafinil and on armodafinil infringement notices (repeated timeouts). We found no EMA statement on modafinil. We make no claims from those bodies.

What laboratories have measured

Study	Samples	What was measured	Result
Assi et al., J Anal Sci Technol 2020 [7]	8 generic batches (100 and 200 mg) from 4 websites	Modafinil content by handheld spectroscopy, checked against HPLC	Tablets contained 57.6 to 72.7% modafinil by mass; the paper reports a quantification method, not a count of failed or fake batches
Nowak et al., J Xenobiotics 2025 [8]	5 tablets given by emergency-service volunteers who said they bought them from websites	Identity and content by mass spectrometry	Modafinil was the only active substance detected; content ranged from 90.7 to 120.8 mg, 45.5 to 80.5% of the labelled dose

Assi’s study is laboratory work on tablets, not human data. Its percentages are mass fractions of the tablet, which includes excipients, so they do not by themselves say whether a tablet met its labelled strength. The authors state funding as “not applicable” and no competing interests [7]. They write that the best model shows accuracy in predicting the concentration of the active ingredient, “proving their authenticity” in the abstract’s wording [7]. That is a claim about the method’s usefulness. It is not a finding that the eight batches were genuine.

Nowak’s five tablets are an anecdotal convenience sample; the authors say the products “most likely came from the black market”. The study reported no external funding and no conflicts [8]. The finding that tablets labelled with different strengths held between 45.5 and 80.5% of the stated dose is an observation on five tablets. It cannot be generalised to any market. The same paper reports three post-mortem cases in which modafinil was present with other substances, including cocaine, amphetamines and synthetic cathinones, and in which modafinil was not the cause of death [8]. Those cases say nothing about counterfeit product.

Customs and seizure statistics

Swissmedic and the Swiss border agency seized 5,668 consignments of illegal medicinal products in 2024, 15% fewer than the 6,659 in 2023 (Swissmedic release of 14 February 2025). Erectile dysfunction products made up 57%; sleeping tablets and tranquillisers, which include psychotropic agents, 10%; “other medicinal products” 12% [4]. Modafinil is not itemised, and there is no way to tell from the table whether any consignments held it. Swissmedic states that online preparations often contain wrongly declared or overdosed active substances, or none. Its test figures (about 32% of 100 erectile dysfunction samples at two to four times the authorised dose) concern that drug class, not modafinil [4].

For the UK, the only modafinil-adjacent figure is the 2016 seizure of more than 31,000 narcolepsy doses [1]. We found no official customs series for modafinil in the UK, EU, US, Canada or Australia in the pages we could open. That is a gap in what we read, not proof that none exists.

Why an open listing proves nothing

A web page offering a prescription medicine shows only that someone published a page. It carries no information about the seller’s legal position, the product’s origin or its contents. The sources illustrate the gap. The MHRA reported nearly 5,000 sites shut down in 2016 and 367 sites and accounts removed in the 2024 to 2025 period [1][3]. Denmark reported six sites to the police in 2026 [2]. Health Canada describes illegitimate sellers as a category of its own [5]. Listings also change quickly, so a page that exists today may be gone once a regulator has acted, and removing a page does nothing to the tablets already shipped.

The same applies to branding, packaging and claims of pharmaceutical grade. In Nowak’s set, labelled tablets contained between 45.5 and 80.5% of the stated dose [8], and Assi’s authors treat packaging and brand as something to be authenticated by instrument, not accepted [7]. We did not find any source that gives a reliable way to judge a product from the listing, and this article does not attempt to supply one.

Risks and unknowns

Documented in the sources. General harms of illegitimate online medicines: wrong or missing active ingredient, contaminants, unexpected interactions, improper storage [5][6]. For stimulant-type “cognitive enhancers” the MHRA lists dependence, cardiovascular problems and psychosis [1]. The effects of genuine modafinil, including serious skin reactions and the interaction with hormonal contraception, are in modafinil side effects and interactions. A counterfeit would add unknown variables to those.

Not documented. We found no case series, poison-centre report or regulator analysis that links a harm to a counterfeit modafinil or armodafinil product. We found no regulator laboratory report of seized modafinil tablets with a wrong active ingredient. We found no population-level estimate of how many tablets sold online are fake, underdosed or substandard. Swissmedic’s overdose figures describe a different drug class [4]. The WHO figure of 50% counterfeits among illegal online pharmacies quoted by Assi dates to 2006, is cited second-hand and is not specific to modafinil [7]. Armodafinil is not examined in either laboratory paper.

Frequently asked questions

Is counterfeit modafinil common?

We could not verify a rate. The two laboratory papers we opened tested 8 batches and 5 tablets, respectively, and neither was designed to estimate prevalence [7][8]. Regulators warn about online medicines in general without giving a modafinil figure [5][6].

What have regulators said about modafinil specifically?

The MHRA’s 2016 release said modafinil is licensed for specific medical conditions and listed risks of misusing cognitive enhancers [1]. The Pangea reports we opened from the MHRA (2025) and the Danish Medicines Agency (2026) do not name it [2][3]. We could not open TGA or Interpol pages.

Do customs statistics show how much modafinil is seized?

Not in what we could read. Swissmedic’s 2024 figures group sleeping tablets and tranquillisers at 10% of 5,668 consignments and do not list modafinil [4].

Does a professional-looking website mean the medicine is legitimate?

No source we read supports that. Regulators remove sites and accounts in large numbers [1][3], and Health Canada lists wrong or absent ingredients among the risks of illegitimate sellers [5].

Sources

1. MHRA, “Freshers warned to be smart and avoid Modafinil” (26 Sep 2016). https://www.gov.uk/government/news/freshers-warned-to-be-smart-and-avoid-modafinil
2. Danish Medicines Agency (Laegemiddelstyrelsen), “Operation Pangea XVIII: Global action against falsified medicines and illicit trade” (7 May 2026). https://laegemiddelstyrelsen.dk/en/news/2026/operation-pangea-xviii-global-action-against-falsified-medicines-and-illicit-trade/
3. MHRA, “MHRA seizes 7.7 million doses of illegal medicines and removes hundreds of illegal online listings as part of Operation Pangea” (25 Jun 2025). https://www.gov.uk/government/news/mhra-seizes-77-million-doses-of-illegal-medicines-and-removes-hundreds-of-illegal-online-listings-as-part-of-operation-pangea
4. Swissmedic, “Illegale Arzneimittelimporte 2024” statistics and press release (14 Feb 2025). https://swissmedic.ch/swissmedic/en/medicrime/news/statistics/illegale-arzneimittelimporte-2024.html
5. Health Canada, “Buying drugs online” (page modified 23 Oct 2026). https://www.canada.ca/en/health-canada/services/buying-drugs-over-internet.html
6. FDA, “The Possible Dangers of Buying Medicines Over the Internet” (page current as of 01/02/2025, as printed). https://www.fda.gov/consumers/consumer-updates/how-buy-medicines-safely-online-pharmacy
7. Assi S, Khan I, Edwards A, Osselton D, Al-Obaidi H, “On-spot quantification of modafinil in generic medicines purchased from the Internet using handheld FTIR, NIR and Raman spectroscopy”, Journal of Analytical Science and Technology 11:35 (2020). https://doi.org/10.1186/s40543-020-00229-3 (read as the open-access PDF copy hosted by Liverpool John Moores University)
8. Nowak K, Chlopas-Konowalek A, Szpot P, Zawadzki M, “The Issue of Smart Drugs on the Example of Modafinil: Toxicological Analysis of Evidences and Biological Samples”, Journal of Xenobiotics 15(1):15 (17 Jan 2025). https://pmc.ncbi.nlm.nih.gov/articles/PMC11755661/ (first 100,000 of about 136,500 characters read)

This article is information, not medical advice.