{"id":238,"date":"2026-11-02T17:54:34","date_gmt":"2026-11-02T17:54:34","guid":{"rendered":"https:\/\/yourmedsuk.com\/insights\/modafinil-interactions\/"},"modified":"2026-11-02T17:54:34","modified_gmt":"2026-11-02T17:54:34","slug":"modafinil-interactions","status":"publish","type":"post","link":"https:\/\/yourmedsuk.com\/insights\/modafinil-interactions\/","title":{"rendered":"Modafinil and alcohol: caffeine, contraception and other interactions"},"content":{"rendered":"<div class=\"ym-article\">\n<p class=\"ym-answer\">The UK product information for modafinil does not list alcohol as an interaction, but it gives no advice that drinking is safe either. Modafinil and alcohol can both cause dizziness and affect your sleep and judgement, so ask your prescriber before you drink. Modafinil&#8217;s bigger interactions are with other medicines, especially hormonal contraception, which it can make less effective.<\/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).<\/li>\n<li><strong>Needs a prescription:<\/strong> Yes<\/li>\n<li><strong>Last checked:<\/strong> November 2026<\/li>\n<\/ul>\n<\/div>\n<p>This guide explains what UK sources say about modafinil with alcohol, caffeine and other medicines. It sets out why these interactions happen and which medicines matter most. 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=\"why\">Why modafinil interacts with other medicines<\/h2>\n<p>Your liver breaks down most medicines using a family of enzymes called cytochrome P450 (CYP). Modafinil changes how some of these enzymes work. This can raise or lower the level of another medicine in your blood.<\/p>\n<p>The <a href=\"https:\/\/www.medicines.org.uk\/emc\/product\/4319\/smpc\">UK Summary of Product Characteristics (SmPC) for modafinil<\/a> describes three main effects:<\/p>\n<table>\n<thead>\n<tr>\n<th>Effect of modafinil<\/th>\n<th>What it can mean<\/th>\n<th>Examples from the SmPC<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Speeds up CYP3A4\/5 (induction)<\/td>\n<td>Some medicines are cleared faster and may work less well<\/td>\n<td>Hormonal contraceptives, ciclosporin, HIV protease inhibitors, buspirone, triazolam, midazolam, most calcium channel blockers and statins<\/td>\n<\/tr>\n<tr>\n<td>May slow CYP2C19 (inhibition)<\/td>\n<td>Some medicines build up and may need a lower dose<\/td>\n<td>Diazepam, propranolol, omeprazole, phenytoin, some antidepressants<\/td>\n<\/tr>\n<tr>\n<td>May suppress CYP2C9<\/td>\n<td>Some medicines are cleared more slowly<\/td>\n<td>Warfarin, phenytoin<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>It works the other way too. The SmPC says strong enzyme inducers, such as the epilepsy medicines carbamazepine and phenobarbital, could lower modafinil levels.<\/p>\n<p>Modafinil also stays in your body for a long time. The SmPC gives an effective half-life of about 15 hours after repeated doses. So an interaction can matter even if you take the two things hours apart.<\/p>\n<h2 id=\"alcohol\">Modafinil and alcohol<\/h2>\n<h3>What the UK product information says<\/h3>\n<p>Neither the SmPC nor the <a href=\"https:\/\/www.medicines.org.uk\/emc\/files\/pil.4319.pdf\">patient information leaflet (PIL) for modafinil<\/a> lists alcohol as an interaction. They do not give a &#8220;safe&#8221; amount either. So there is no official UK advice that drinking on modafinil is fine.<\/p>\n<p>The leaflet does ask you to tell your doctor if you have had alcohol or drug problems in the past. The SmPC advises caution in people with a history of alcohol, drug or illicit substance abuse. This is partly because studies have shown modafinil has some potential for dependence.<\/p>\n<h3>Why it makes sense to be careful<\/h3>\n<p>Some effects of modafinil overlap with the effects of alcohol:<\/p>\n<ul>\n<li><strong>Dizziness and blurred vision.<\/strong> The PIL says these affect up to 1 in 10 people taking modafinil. Alcohol can make you dizzy too.<\/li>\n<li><strong>Sleep.<\/strong> Difficulty sleeping is a common side effect of modafinil. The <a href=\"https:\/\/www.nhs.uk\/conditions\/insomnia\/\">NHS lists alcohol as a cause of insomnia<\/a>.<\/li>\n<li><strong>Mood.<\/strong> The SmPC advises caution in people with a history of depression, anxiety or other mental health problems. Alcohol can affect these as well.<\/li>\n<\/ul>\n<p>Feeling alert on modafinil does not mean alcohol is affecting you less. If you drink, keep within the <a href=\"https:\/\/www.nhs.uk\/live-well\/alcohol-advice\/calculating-alcohol-units\/\">NHS low-risk guideline<\/a> of no more than 14 units a week on a regular basis, spread over 3 or more days.<\/p>\n<h3>Drinking, modafinil and driving<\/h3>\n<p>The SmPC warns that your wakefulness may not return to normal on modafinil. Your prescriber should keep checking how sleepy you are and may advise you not to drive. The PIL says do not drive if you feel dizzy, have blurred vision or still feel very sleepy.<\/p>\n<p>Adding alcohol makes these risks harder to judge. Never drive after drinking, whether or not you take modafinil.<\/p>\n<h3>Alcohol and narcolepsy<\/h3>\n<p>The <a href=\"https:\/\/www.nhs.uk\/conditions\/narcolepsy\/treatment\/\">NHS narcolepsy treatment page<\/a> suggests avoiding caffeine, alcohol and smoking before bed. Good night-time sleep is part of managing the condition, alongside medicine. You can read more in our <a href=\"https:\/\/yourmedsuk.com\/insights\/narcolepsy\/\">guide to narcolepsy and excessive sleepiness<\/a>.<\/p>\n<h2 id=\"caffeine\">Caffeine and modafinil<\/h2>\n<p>Caffeine is not listed as an interaction in the SmPC or the PIL. But the SmPC does mention it. It says modafinil is not a replacement for sleep, and good sleep habits may include a review of your caffeine intake.<\/p>\n<p>Caffeine and modafinil can cause some of the same effects. The SmPC lists a fast heartbeat and palpitations as common side effects of modafinil, along with nervousness and sleep problems. Too much caffeine can add to these. Our guide to <a href=\"https:\/\/yourmedsuk.com\/insights\/modafinil-heart-blood-pressure\/\">modafinil, your heart and blood pressure<\/a> explains why heart checks matter.<\/p>\n<h3>How much caffeine is too much?<\/h3>\n<p>The <a href=\"https:\/\/www.efsa.europa.eu\/en\/topics\/topic\/caffeine\">European Food Safety Authority (EFSA) review of caffeine<\/a> gives these figures for healthy adults who are not pregnant:<\/p>\n<ul>\n<li>Up to 400 mg a day, spread through the day, does not raise safety concerns.<\/li>\n<li>Single doses up to 200 mg do not raise safety concerns.<\/li>\n<li>Even 100 mg close to bedtime may affect sleep in some adults.<\/li>\n<\/ul>\n<p>EFSA estimates a 200 ml cup of filter coffee has about 90 mg and a 250 ml energy drink about 80 mg. These limits are for healthy adults, not specifically for people taking modafinil. Your prescriber may suggest less, especially if you notice palpitations or poor sleep.<\/p>\n<ul>\n<li>Keep track of all sources: coffee, tea, cola and energy drinks.<\/li>\n<li>Avoid caffeine later in the day, so it does not cut into your night-time sleep.<\/li>\n<li>Tell your prescriber if you get a racing heart, chest pain or anxiety.<\/li>\n<\/ul>\n<h2 id=\"contraception\">Hormonal contraception: the most important interaction<\/h2>\n<p>The SmPC says modafinil may make steroidal contraceptives less effective, by speeding up CYP3A4\/5. The PIL says this includes the contraceptive pill, implants, patches and intrauterine devices that release hormones.<\/p>\n<p>The <a href=\"https:\/\/www.gov.uk\/drug-safety-update\/modafinil-provigil-increased-risk-of-congenital-malformations-if-used-during-pregnancy\">MHRA Drug Safety Update from November 2020<\/a> says you must use effective contraception while you take modafinil and for 2 months after stopping. This matters because modafinil may increase the risk of birth defects. Based on UK sexual health guidance, it advises avoiding these methods with enzyme-inducing medicines such as modafinil:<\/p>\n<ul>\n<li>combined pills, vaginal rings and patches<\/li>\n<li>the progestogen-only pill<\/li>\n<li>the progestogen-only implant<\/li>\n<li>ulipristal acetate emergency contraception<\/li>\n<\/ul>\n<p>The same update names the copper IUD, the levonorgestrel intrauterine system (hormonal coil) and the progestogen-only injection as suitable long-term methods. For short courses of about 2 months, barrier methods plus your usual contraception may be advised. Our guide to <a href=\"https:\/\/yourmedsuk.com\/insights\/modafinil-pregnancy-contraception\/\">modafinil, pregnancy and contraception<\/a> covers this in more detail.<\/p>\n<h2 id=\"medicines\">Other medicines that interact with modafinil<\/h2>\n<p>The leaflet asks you to tell your doctor or pharmacist about every medicine you take. This table summarises the main groups named in the SmPC and PIL.<\/p>\n<table>\n<thead>\n<tr>\n<th>Medicine or group<\/th>\n<th>What can happen<\/th>\n<th>What usually happens next<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Epilepsy medicines: carbamazepine, phenobarbital<\/td>\n<td>May lower modafinil levels<\/td>\n<td>Your prescriber reviews whether modafinil still works<\/td>\n<\/tr>\n<tr>\n<td>Phenytoin (epilepsy)<\/td>\n<td>Clearance may fall, raising levels<\/td>\n<td>Checks for signs of toxicity; blood levels may be measured<\/td>\n<\/tr>\n<tr>\n<td>Warfarin<\/td>\n<td>Clearance may fall<\/td>\n<td>Clotting tests regularly for the first 2 months and after dose changes<\/td>\n<\/tr>\n<tr>\n<td>Ciclosporin (transplant, arthritis or psoriasis)<\/td>\n<td>Levels may fall; one case report showed a 50% drop<\/td>\n<td>Your specialist may monitor levels<\/td>\n<\/tr>\n<tr>\n<td>Antidepressants: some tricyclics and SSRIs, such as amitriptyline, citalopram or fluoxetine<\/td>\n<td>Levels may rise in some people<\/td>\n<td>A lower antidepressant dose may be needed<\/td>\n<\/tr>\n<tr>\n<td>Diazepam, propranolol, omeprazole<\/td>\n<td>Clearance may fall<\/td>\n<td>A dose reduction may be needed<\/td>\n<\/tr>\n<tr>\n<td>HIV protease inhibitors, such as indinavir or ritonavir<\/td>\n<td>Levels may fall<\/td>\n<td>Specialist review<\/td>\n<\/tr>\n<tr>\n<td>Calcium channel blockers (such as amlodipine or verapamil) and statins (such as atorvastatin or simvastatin)<\/td>\n<td>Levels may fall, so they may work less well<\/td>\n<td>Your prescriber may check your blood pressure or cholesterol<\/td>\n<\/tr>\n<tr>\n<td>Buspirone, triazolam, midazolam<\/td>\n<td>Levels may fall<\/td>\n<td>Prescriber review<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Do not stop or change any of these medicines yourself. Take each one exactly as your prescriber tells you. If a dose needs to change, they will tell you how.<\/p>\n<h2 id=\"tell-prescriber\">Telling your prescriber and pharmacist<\/h2>\n<p>Interactions are easiest to manage when your prescriber knows everything you take. Before you start modafinil, and whenever something changes, mention:<\/p>\n<ul>\n<li>all prescribed medicines, including ones from a hospital specialist<\/li>\n<li>medicines from a pharmacy or shop, such as cold and flu remedies<\/li>\n<li>herbal remedies and supplements<\/li>\n<li>your contraception, including the type of coil or implant<\/li>\n<li>how much alcohol and caffeine you usually have<\/li>\n<\/ul>\n<p>Only take modafinil that a UK prescriber has prescribed for you. It is licensed only for excessive sleepiness in adults with narcolepsy. The <a href=\"https:\/\/www.gov.uk\/drug-safety-update\/modafinil-provigil-now-restricted-to-narcolepsy\">MHRA confirmed it is no longer licensed<\/a> for shift-work sleep disorder or obstructive sleep apnoea. Our guide <a href=\"https:\/\/yourmedsuk.com\/insights\/is-modafinil-legal-uk\/\">Is modafinil legal in the UK?<\/a> explains its legal status.<\/p>\n<div class=\"ym-help\">\n<h2>When to get help<\/h2>\n<p><strong>Call 999 or go to A&amp;E<\/strong> if you take modafinil and:<\/p>\n<ul>\n<li>have chest pain, or a fast or irregular heartbeat with fainting or breathlessness<\/li>\n<li>develop a rash with blistering, peeling skin or sores in your mouth<\/li>\n<li>have swelling of your face, lips or throat, or difficulty breathing<\/li>\n<li>have thoughts of harming yourself<\/li>\n<\/ul>\n<p><strong>Contact your GP or prescriber, or call NHS 111<\/strong>, if you:<\/p>\n<ul>\n<li>get palpitations, anxiety or sleep problems after starting a new medicine or more caffeine<\/li>\n<li>think your contraception may not have worked, or you might be pregnant<\/li>\n<li>feel unwell after drinking alcohol while taking 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>Can I drink alcohol with modafinil?<\/h3>\n<p>The UK product information does not list alcohol as an interaction, but it does not say drinking is safe. Both can cause dizziness and affect sleep, and caution is advised if you have had alcohol problems. Ask your prescriber what is right for you.<\/p>\n<h3>Can I drink coffee or take caffeine with modafinil?<\/h3>\n<p>Caffeine is not a listed interaction. But both can cause a fast heartbeat, nervousness and poor sleep, and the SmPC suggests reviewing your caffeine intake. Avoid caffeine late in the day.<\/p>\n<h3>How long does modafinil stay in your system?<\/h3>\n<p>The SmPC gives an effective half-life of about 15 hours after repeated doses. That means interactions can still matter many hours after a dose.<\/p>\n<h3>Does modafinil stop the pill working?<\/h3>\n<p>It may make the pill less effective. The MHRA says to use effective contraception during treatment and for 2 months after stopping. Methods such as the copper IUD, hormonal coil or injection are suitable.<\/p>\n<h3>What medicines should not be taken with modafinil?<\/h3>\n<p>The main ones named in the UK leaflet include hormonal contraceptives, epilepsy medicines, warfarin, ciclosporin, some antidepressants, omeprazole, HIV medicines, statins and some blood pressure medicines. Your prescriber may adjust doses or monitor 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\/modafinil-side-effects\/\">Modafinil side effects: common, serious and when to get help<\/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\/is-modafinil-legal-uk\/\">Is modafinil legal in the UK?<\/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\/check-uk-online-pharmacy\/\">How to check an online pharmacy is legitimate in the UK<\/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), revised February 2024, accessed November 2026<\/li>\n<li><a href=\"https:\/\/www.medicines.org.uk\/emc\/files\/pil.4319.pdf\">Modafinil 100 mg and 200 mg tablets \u2013 Patient Information Leaflet<\/a>, electronic medicines compendium (emc), revised August 2024, accessed November 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 November 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, March 2011, accessed November 2026<\/li>\n<li><a href=\"https:\/\/www.nhs.uk\/conditions\/narcolepsy\/treatment\/\">Narcolepsy: treatment<\/a>, NHS, accessed November 2026<\/li>\n<li><a href=\"https:\/\/www.nhs.uk\/live-well\/alcohol-advice\/calculating-alcohol-units\/\">Alcohol units<\/a>, NHS, reviewed August 2024, accessed November 2026<\/li>\n<li><a href=\"https:\/\/www.nhs.uk\/conditions\/insomnia\/\">Insomnia<\/a>, NHS, reviewed March 2024, accessed November 2026<\/li>\n<li><a href=\"https:\/\/www.efsa.europa.eu\/en\/topics\/topic\/caffeine\">Caffeine<\/a>, European Food Safety Authority (scientific opinion May 2015), accessed November 2026<\/li>\n<li><a href=\"https:\/\/yellowcard.mhra.gov.uk\/\">Yellow Card scheme<\/a>, MHRA, accessed November 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>Can you drink alcohol or coffee on modafinil? What the UK product information says about modafinil and alcohol, caffeine, hormonal contraception and other medicines, why these interactions happen, and when to get help.<\/p>\n","protected":false},"author":1,"featured_media":237,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[],"class_list":["post-238","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 and Alcohol: Caffeine &amp; Medicines | Your Meds UK<\/title>\n<meta name=\"description\" content=\"Modafinil and alcohol, caffeine and other medicines: what UK guidance says, why the pill may not work, which medicines interact and when to get help.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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