{"id":130,"date":"2026-10-25T10:28:22","date_gmt":"2026-10-25T10:28:22","guid":{"rendered":"https:\/\/yourmedsuk.com\/insights\/modafinil-side-effects\/"},"modified":"2026-11-02T17:56:29","modified_gmt":"2026-11-02T17:56:29","slug":"modafinil-side-effects","status":"publish","type":"post","link":"https:\/\/yourmedsuk.com\/insights\/modafinil-side-effects\/","title":{"rendered":"Modafinil side effects: common, serious and when to get help"},"content":{"rendered":"<div class=\"ym-article\">\n<p class=\"ym-answer\">Headache is the most common of the modafinil side effects, reported in about 21% of people in the UK product information. Other common side effects include nervousness, anxiety, trouble sleeping, dizziness, a fast heartbeat and stomach upset. Rare but serious side effects include skin rashes, changes in mental health and allergic reactions, which mean you should stop taking it and contact a doctor straight away.<\/p>\n<div class=\"ym-facts\">\n<h2>Key facts<\/h2>\n<ul>\n<li><strong>What it is:<\/strong> A wakefulness-promoting medicine.<\/li>\n<li><strong>Licensed use (UK):<\/strong> Excessive sleepiness associated with narcolepsy, with or without cataplexy, in adults.<\/li>\n<li><strong>Legal status:<\/strong> Prescription-only medicine (POM). Not recommended for anyone under 18.<\/li>\n<li><strong>Needs a prescription:<\/strong> Yes<\/li>\n<li><strong>Last checked:<\/strong> October 2026<\/li>\n<\/ul>\n<\/div>\n<p>This guide explains the modafinil side effects listed in the official UK product information, how often they happen and what to do about them. It also covers the questions people ask most, such as headaches and anxiety. For an overview of the medicine itself, read our <a href=\"https:\/\/yourmedsuk.com\/insights\/modafinil\/\">complete guide to modafinil<\/a>.<\/p>\n<h2 id=\"how-common\">How common are modafinil side effects?<\/h2>\n<p>The <a href=\"https:\/\/www.medicines.org.uk\/emc\/product\/4319\/smpc\">Summary of Product Characteristics (SmPC) for modafinil 100 mg tablets<\/a> sorts side effects by how often they were reported. Headache is the only one listed as &#8220;very common&#8221;. The table below groups the main ones in plain English.<\/p>\n<table>\n<thead>\n<tr>\n<th>How often<\/th>\n<th>Side effects listed in the SmPC<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Very common (more than 1 in 10 people)<\/td>\n<td>Headache<\/td>\n<\/tr>\n<tr>\n<td>Common (up to 1 in 10)<\/td>\n<td>Loss of appetite; nervousness, anxiety, trouble sleeping, low mood, confusion, irritability; dizziness, sleepiness, pins and needles; blurred vision; fast heartbeat or palpitations; flushing; stomach pain, feeling sick, dry mouth, diarrhoea, indigestion, constipation; weakness; chest pain; changes in liver blood tests<\/td>\n<\/tr>\n<tr>\n<td>Uncommon (up to 1 in 100)<\/td>\n<td>Many effects, including suicidal thoughts, aggression, agitation, abnormal dreams, migraine, tremor, high or low blood pressure, irregular or slow heartbeat, rash, itching, acne, sweating, back and muscle pain, weight gain or loss, raised blood sugar or cholesterol, and hay-fever-like symptoms<\/td>\n<\/tr>\n<tr>\n<td>Rare (up to 1 in 1,000)<\/td>\n<td>Hallucinations, mania, psychosis<\/td>\n<\/tr>\n<tr>\n<td>Not known<\/td>\n<td>Severe allergic reaction (anaphylaxis), swelling under the skin (angioedema), hives, delusions, and serious skin reactions such as Stevens-Johnson syndrome, toxic epidermal necrolysis and DRESS<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&#8220;Not known&#8221; means the frequency cannot be worked out from the available data. It does not mean these effects are common. The full list is in the <a href=\"https:\/\/www.medicines.org.uk\/emc\/files\/pil.4319.pdf\">patient information leaflet<\/a> that comes with your tablets.<\/p>\n<h2 id=\"headache\">Modafinil headache<\/h2>\n<p>Headache is the side effect people notice most. The SmPC says it affects about 21% of patients and is usually mild or moderate. It is dose-dependent and usually goes away within a few days.<\/p>\n<p>In a <a href=\"https:\/\/scholars.duke.edu\/publication\/876935\">large US trial of modafinil for narcolepsy<\/a>, published in <em>Neurology<\/em> in 2000, headache was the most frequent complaint. However, it was not significantly more common with modafinil than with a dummy tablet (placebo).<\/p>\n<p>If you get headaches:<\/p>\n<ul>\n<li>keep taking your dose exactly as your prescriber tells you, and do not change it yourself<\/li>\n<li>ask your pharmacist which painkiller is suitable alongside your other medicines<\/li>\n<li>tell your prescriber if the headaches do not settle after the first few days, or if they are severe<\/li>\n<\/ul>\n<p>Migraine is listed as an uncommon side effect. If you already get migraines, mention this when your treatment is reviewed.<\/p>\n<h2 id=\"anxiety-mood\">Modafinil anxiety, nervousness and mood changes<\/h2>\n<p>Feeling nervous, anxious or irritable is common with modafinil. Low mood and confusion are also listed as common in the SmPC.<\/p>\n<p>The UK patient leaflet is clear about what to do. It says to stop taking modafinil and tell your doctor straight away if you notice any change in your mental health and wellbeing. Its list of signs includes:<\/p>\n<ul>\n<li>anxiety or nervousness, mood swings or abnormal thinking<\/li>\n<li>aggression or hostility, agitation, or feeling over-excited or hyperactive<\/li>\n<li>depression, or suicidal thoughts or behaviour<\/li>\n<li>psychosis, which can include delusions or sensing things that are not real<\/li>\n<li>feeling detached or numb<\/li>\n<\/ul>\n<p>The SmPC tells prescribers that if psychiatric symptoms develop, modafinil should be stopped and not restarted. Tell your prescriber before you start if you have ever had depression, anxiety, psychosis or mania. Your specialist can then weigh up whether modafinil is right for you.<\/p>\n<h2 id=\"sleep-driving\">Sleep, alertness and driving<\/h2>\n<p>The intended effect of modafinil is to reduce excessive daytime sleepiness caused by narcolepsy. It is not a cure, and it may not bring your alertness fully back to normal.<\/p>\n<h3>Trouble sleeping<\/h3>\n<p>Because modafinil promotes wakefulness, difficulty sleeping (insomnia) is a common side effect. The SmPC asks prescribers to watch for signs of it. If you are struggling to sleep at night, talk to your prescriber rather than changing when or how much you take.<\/p>\n<h3>Driving and machinery<\/h3>\n<p>The leaflet says modafinil can cause blurred vision or dizziness in up to 1 in 10 people. Do not drive or use machinery if you are affected, or if you still feel very sleepy.<\/p>\n<p>Separately, the <a href=\"https:\/\/www.gov.uk\/narcolepsy-and-driving\">GOV.UK guidance on narcolepsy and driving<\/a> says you must tell the DVLA if you have narcolepsy. You can be fined if you do not report a medical condition that affects your driving, and prosecuted if you have an accident because of it.<\/p>\n<h2 id=\"skin-allergy\">Skin rashes and allergic reactions<\/h2>\n<p>Serious skin reactions are rare, but they are the main reason the leaflet tells you to watch for any rash. The SmPC says modafinil should be stopped at the first sign of rash and not restarted.<\/p>\n<p>These reactions include Stevens-Johnson syndrome, toxic epidermal necrolysis and DRESS (drug rash with eosinophilia and systemic symptoms). According to the SmPC, serious rashes have appeared 1 to 5 weeks after starting treatment. Isolated cases have been reported after about 3 months.<\/p>\n<p>Stop taking modafinil and contact your doctor straight away if you notice:<\/p>\n<ul>\n<li>a skin rash or itching, especially if it covers your whole body<\/li>\n<li>blistering or peeling skin<\/li>\n<li>ulcers in your mouth, eyes, nose or genitals<\/li>\n<li>a high temperature together with a rash<\/li>\n<\/ul>\n<p>The SmPC also describes a rare reaction affecting several organs at once (multi-organ hypersensitivity), including at least one death reported after the medicine was marketed. Children have a higher risk of serious rash, which is one reason modafinil is not recommended for anyone under 18.<\/p>\n<h2 id=\"heart\">Heart and blood pressure side effects<\/h2>\n<p>A fast heartbeat, palpitations and chest pain are listed as common side effects. High or low blood pressure, an irregular or slow heartbeat and an abnormal heart trace (ECG) are uncommon.<\/p>\n<p>For this reason, the SmPC says modafinil must not be used by people with uncontrolled moderate to severe high blood pressure or heart rhythm problems (arrhythmias). The <a href=\"https:\/\/www.gov.uk\/drug-safety-update\/modafinil-provigil-now-restricted-to-narcolepsy\">MHRA&#8217;s Drug Safety Update<\/a> advises that:<\/p>\n<ul>\n<li>a baseline ECG should be done before treatment starts<\/li>\n<li>blood pressure and heart rate should be checked regularly during treatment<\/li>\n<li>modafinil should be stopped if an arrhythmia or moderate to severe high blood pressure develops<\/li>\n<\/ul>\n<p>Go to your monitoring appointments, and tell your specialist about any heart condition or high blood pressure before you start. Read more in our guide to <a href=\"https:\/\/yourmedsuk.com\/insights\/modafinil-heart-blood-pressure\/\">modafinil and your heart<\/a>.<\/p>\n<h2 id=\"other-effects\">Other things to know<\/h2>\n<h3>Appetite, weight and blood tests<\/h3>\n<p>Loss of appetite is common. Weight gain, weight loss and increased appetite are listed as uncommon. Changes in liver blood tests are common, and raised blood sugar or cholesterol are uncommon, so your specialist may arrange blood tests.<\/p>\n<h3>Dependence<\/h3>\n<p>The SmPC says studies have shown a potential for dependence. It advises caution in people with a history of psychiatric disorders or substance misuse. Take only the dose you are prescribed.<\/p>\n<h3>Contraception and pregnancy<\/h3>\n<p>Modafinil can make hormonal contraceptives, including the pill, less effective. The SmPC recommends other or additional methods during treatment and for two months after stopping.<\/p>\n<p>In November 2020 the <a href=\"https:\/\/www.gov.uk\/drug-safety-update\/modafinil-provigil-increased-risk-of-congenital-malformations-if-used-during-pregnancy\">MHRA advised that modafinil should not be used in pregnancy<\/a>. Early registry data suggested a possible increased risk of birth defects. Talk to your doctor before stopping contraception or if you are planning a pregnancy. Our guide to <a href=\"https:\/\/yourmedsuk.com\/insights\/modafinil-pregnancy-contraception\/\">modafinil and pregnancy<\/a> explains which contraceptive methods are affected.<\/p>\n<p>Caffeine, alcohol and some other medicines can add to these side effects or change how modafinil works. Our guide to <a href=\"https:\/\/yourmedsuk.com\/insights\/modafinil-interactions\/\">modafinil and alcohol, caffeine and other interactions<\/a> explains what UK sources say.<\/p>\n<h3>Why modafinil is only licensed for narcolepsy<\/h3>\n<p>Modafinil used to be licensed for other sleep problems too. In July 2010 the <a href=\"https:\/\/ema.europa.eu\/en\/documents\/press-release\/european-medicines-agency-recommends-restricting-use-modafinil_en.pdf\">European Medicines Agency recommended restricting its use<\/a> after a review of psychiatric, skin and heart risks. It concluded the benefits outweighed the risks only in narcolepsy. The UK licence was restricted in the same way.<\/p>\n<p>This is why it is not licensed to improve focus or study performance. Our guide on <a href=\"https:\/\/yourmedsuk.com\/insights\/check-uk-online-pharmacy\/\">how to check a UK online pharmacy<\/a> explains how to spot sellers offering prescription medicines without proper checks.<\/p>\n<h2 id=\"what-to-do\">What to do if you get side effects<\/h2>\n<ol>\n<li><strong>Serious signs:<\/strong> for a rash, an allergic reaction or any change in your mental health, stop taking modafinil and contact your doctor straight away, as the leaflet advises.<\/li>\n<li><strong>Bothersome but mild effects:<\/strong> keep taking it and speak to your prescriber or pharmacist. Do not change your dose yourself.<\/li>\n<li><strong>Report it:<\/strong> tell the MHRA about suspected side effects through the Yellow Card scheme.<\/li>\n<\/ol>\n<p>Narcolepsy can also be managed with regular sleep routines and planned naps, as the <a href=\"https:\/\/www.nhs.uk\/conditions\/narcolepsy\/treatment\/\">NHS explains in its narcolepsy treatment guide<\/a>. Read more in our <a href=\"https:\/\/yourmedsuk.com\/insights\/narcolepsy\/\">guide to narcolepsy and excessive sleepiness<\/a>. If you also take a sleeping tablet, our article on the <a href=\"https:\/\/yourmedsuk.com\/insights\/zopiclone-side-effects\/\">side effects of zopiclone<\/a> may help.<\/p>\n<div class=\"ym-help\">\n<h2>When to get help<\/h2>\n<p><strong>Call 999 or go to A&amp;E if you or someone else:<\/strong><\/p>\n<ul>\n<li>has swelling of the lips, face, tongue or throat, or difficulty breathing or swallowing<\/li>\n<li>has a widespread rash with blistering or peeling skin<\/li>\n<li>has severe chest pain<\/li>\n<li>feels they may act on thoughts of suicide or self-harm<\/li>\n<\/ul>\n<p><strong>Call NHS 111 or speak to your GP or specialist urgently if you:<\/strong><\/p>\n<ul>\n<li>notice any new rash or itching<\/li>\n<li>feel anxious, low, agitated or not yourself, or see or hear things that are not there<\/li>\n<li>have a racing, pounding or irregular heartbeat, or unexplained breathlessness<\/li>\n<li>think you have taken too much modafinil<\/li>\n<\/ul>\n<p>You can report any suspected side effect to the MHRA through the <a href=\"https:\/\/yellowcard.mhra.gov.uk\/\">Yellow Card scheme<\/a>. Anyone can report.<\/p>\n<\/div>\n<div class=\"ym-faq\">\n<h2>Frequently asked questions<\/h2>\n<h3>How long do modafinil side effects last?<\/h3>\n<p>The SmPC says headache usually goes away within a few days. For other side effects there is no set time. Tell your prescriber about anything that lasts or worries you.<\/p>\n<h3>Can modafinil cause anxiety?<\/h3>\n<p>Yes. Anxiety and nervousness are common side effects. The UK leaflet says to stop taking it and tell your doctor straight away if you notice any change in your mental health.<\/p>\n<h3>Is headache a normal side effect of modafinil?<\/h3>\n<p>Headache is the most common side effect, reported in about 21% of patients. It is usually mild or moderate and short-lived. See your prescriber if it is severe or does not settle.<\/p>\n<h3>Does modafinil cause weight loss?<\/h3>\n<p>Loss of appetite is common. Weight loss and weight gain are both listed as uncommon. Tell your specialist if your weight or appetite changes noticeably.<\/p>\n<h3>Does modafinil affect the contraceptive pill?<\/h3>\n<p>Yes. Modafinil can make hormonal contraception less effective. You need other or additional contraception during treatment and for two months after stopping. Ask your doctor which method suits you.<\/p>\n<\/div>\n<div class=\"ym-related\">\n<h2>Related guides<\/h2>\n<ul>\n<li><a href=\"https:\/\/yourmedsuk.com\/insights\/modafinil\/\">Modafinil: what it is, how it works and who it&#8217;s for<\/a><\/li>\n<li><a href=\"https:\/\/yourmedsuk.com\/insights\/is-modafinil-legal-uk\/\">Modafinil in the UK: is it legal and is it a controlled drug?<\/a><\/li>\n<li><a href=\"https:\/\/yourmedsuk.com\/insights\/modafinil-pregnancy-contraception\/\">Modafinil and pregnancy: birth defect risk, contraception and breastfeeding<\/a><\/li>\n<li><a href=\"https:\/\/yourmedsuk.com\/insights\/modafinil-heart-blood-pressure\/\">Is modafinil safe? Your heart, blood pressure and long-term use<\/a><\/li>\n<li><a href=\"https:\/\/yourmedsuk.com\/insights\/zopiclone-side-effects\/\">Side effects of zopiclone, including next-day effects<\/a><\/li>\n<li><a href=\"https:\/\/yourmedsuk.com\/insights\/check-uk-online-pharmacy\/\">How to check a UK online pharmacy<\/a><\/li>\n<li><a href=\"https:\/\/yourmedsuk.com\/insights\/controlled-drugs-uk-explained\/\">Controlled drugs in the UK explained<\/a><\/li>\n<li><a href=\"https:\/\/yourmedsuk.com\/insights\/narcolepsy\/\">Narcolepsy and excessive sleepiness<\/a><\/li>\n<li><a href=\"https:\/\/yourmedsuk.com\/insights\/tapentadol-side-effects\/\">Tapentadol side effects: common, serious and long-term<\/a><\/li>\n<li><a href=\"https:\/\/yourmedsuk.com\/insights\/modafinil-interactions\/\">Modafinil and alcohol: caffeine, contraception and other interactions<\/a><\/li>\n<\/ul>\n<\/div>\n<div class=\"ym-refs\">\n<h2>References<\/h2>\n<ol>\n<li><a href=\"https:\/\/www.medicines.org.uk\/emc\/product\/4319\/smpc\">Modafinil 100 mg tablets \u2013 Summary of Product Characteristics<\/a>, electronic medicines compendium (emc), accessed October 2026<\/li>\n<li><a href=\"https:\/\/www.medicines.org.uk\/emc\/files\/pil.4319.pdf\">Modafinil 100 mg tablets \u2013 Patient Information Leaflet<\/a>, electronic medicines compendium (emc), accessed October 2026<\/li>\n<li><a href=\"https:\/\/www.gov.uk\/drug-safety-update\/modafinil-provigil-now-restricted-to-narcolepsy\">Modafinil (Provigil): now restricted to narcolepsy<\/a>, MHRA Drug Safety Update, GOV.UK, accessed October 2026<\/li>\n<li><a href=\"https:\/\/www.gov.uk\/drug-safety-update\/modafinil-provigil-increased-risk-of-congenital-malformations-if-used-during-pregnancy\">Modafinil (Provigil): increased risk of congenital malformations if used during pregnancy<\/a>, MHRA Drug Safety Update, November 2020, accessed October 2026<\/li>\n<li><a href=\"https:\/\/ema.europa.eu\/en\/documents\/press-release\/european-medicines-agency-recommends-restricting-use-modafinil_en.pdf\">European Medicines Agency recommends restricting the use of modafinil<\/a>, EMA, 22 July 2010, accessed October 2026<\/li>\n<li><a href=\"https:\/\/scholars.duke.edu\/publication\/876935\">US Modafinil in Narcolepsy Multicenter Study Group. Randomized trial of modafinil as a treatment for the excessive daytime somnolence of narcolepsy<\/a>, Neurology 2000;54(5):1166\u20131175, accessed October 2026<\/li>\n<li><a href=\"https:\/\/www.gov.uk\/narcolepsy-and-driving\">Narcolepsy and driving<\/a>, GOV.UK, accessed October 2026<\/li>\n<li><a href=\"https:\/\/www.nhs.uk\/conditions\/narcolepsy\/treatment\/\">Narcolepsy: treatment<\/a>, NHS, accessed October 2026<\/li>\n<li><a href=\"https:\/\/yellowcard.mhra.gov.uk\/\">Yellow Card scheme<\/a>, MHRA, accessed October 2026<\/li>\n<\/ol>\n<\/div>\n<p class=\"ym-disclaimer\">This article is for information only and does not replace advice from your doctor or pharmacist. Read our <a href=\"https:\/\/yourmedsuk.com\/insights\/medical-disclaimer\/\">medical disclaimer<\/a>.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Modafinil side effects explained from the UK product information: how common each one is, headaches, anxiety and mood changes, sleep and driving, serious rashes, heart checks, and when to stop and get help.<\/p>\n","protected":false},"author":1,"featured_media":129,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[],"class_list":["post-130","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-modafinil"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Modafinil Side Effects: Common &amp; Serious | Your Meds UK<\/title>\n<meta name=\"description\" content=\"Modafinil side effects explained from UK 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