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For many of us, the day doesn\u2019t start until we\u2019ve had our first cup of coffee. It\u2019s comforting, energizing, and one of the most widely consumed beverages in the world. But while your morning brew might feel harmless, it can interact with certain medicines in ways that reduce their effectiveness \u2013 or increase the risk of side-effects.<\/p>\n
From common cold tablets to antidepressants, caffeine\u2019s impact on the body goes far beyond a quick energy boost. Tea also contains caffeine but not in the same concentrations as coffee, and doesn\u2019t seem to affect people in the same way. Here\u2019s what you should know about how coffee can interfere with your medications \u2013 and how to stay safe.<\/p>\n
1. Cold And Flu Medicines<\/p>\n
Caffeine<\/a> is a stimulant, which means it speeds up the central nervous system. Pseudoephedrine, a decongestant found in cold and flu remedies<\/a> such as Sudafed, is\u00a0also a stimulant<\/a>. When taken together, the effects can be amplified \u2013 potentially leading to jitters or restlessness, headaches, fast heart rate and insomnia.<\/p>\n Many cold medications already contain added caffeine, increasing these risks further.\u00a0Some studies<\/a>\u00a0also suggest that combining caffeine with pseudoephedrine can raise blood sugar and body temperature \u2013 particularly important for people with diabetes.<\/p>\n Stimulant effects are also a concern when combining caffeine with ADHD medications such as amphetamines, or with\u00a0asthma drugs<\/a>\u00a0such as theophylline, which shares a similar chemical structure to caffeine. Using them together may increase the risk of side-effects such as a rapid heartbeat and sleep disruption.<\/p>\n 2. Thyroid Medication<\/p>\n Levothyroxine, the standard treatment for an under-active thyroid, is highly sensitive to timing \u2013 and your morning coffee can get in the way.\u00a0Studies show<\/a>\u00a0that drinking coffee too soon after taking levothyroxine can reduce its absorption by up to 50%.<\/p>\n Caffeine speeds up gut motility<\/a> (the movement of food and waste through the digestive tract), giving the drug\u00a0less time to be absorbed<\/a>\u00a0\u2013 and\u00a0may also bind<\/a>\u00a0to it in the stomach, making it harder for the body to take in. These effects reduce the drug\u2019s bioavailability, meaning less of it reaches your bloodstream where it\u2019s needed. This interaction\u00a0is more common<\/a>\u00a0with tablet forms of levothyroxine, and less likely with liquid formulations.<\/p>\n If absorption is impaired,\u00a0symptoms of hypothyroidism<\/a>\u00a0\u2013 including fatigue, weight gain and constipation \u2013 can return, even if you\u2019re taking your medicine correctly.<\/p>\n The same timing rule applies to a class of osteoporosis medications called\u00a0bisphosphonates<\/a>, including alendronate and risedronate, which also require an empty stomach and around 30-60 minutes before food or drink is taken.<\/p>\n 3. Antidepressants And Antipsychotics<\/p>\n The interaction between caffeine and mental health medications can be more complex.<\/p>\n Selective serotonin reuptake inhibitors<\/a>\u00a0(SSRIs), such as sertraline and citalopram, are a type of antidepressant medication\u00a0widely used<\/a>\u00a0to treat depression, anxiety and other psychiatric conditions.\u00a0Lab studies<\/a>\u00a0suggest caffeine can bind to these drugs in the stomach, reducing absorption and potentially making them less effective.<\/p>\n Tricyclic antidepressants<\/a> (TCAs), such as amitriptyline and imipramine, are a class of older antidepressants that work by affecting the levels of neurotransmitters in the brain. They were among the first antidepressants developed and are\u00a0less commonly used<\/a>\u00a0today, compared with newer antidepressants such as SSRIs, due to their potential for more side-effects and higher risk of overdose.<\/p>\n TCAs are broken down by the liver enzyme\u00a0CYP1A2<\/a>, which also metabolizes caffeine. The competition between the two can slow drug breakdown,\u00a0increasing side-effects<\/a>, or delay caffeine clearance, making you feel jittery or wired longer than usual.<\/p>\n Clozapine, an antipsychotic, is also processed by CYP1A2.\u00a0One study showed<\/a>\u00a0that drinking two-to-three cups of coffee could increase blood levels of clozapine by up to 97%,\u00a0potentially increasing risks<\/a>\u00a0such as drowsiness, confusion, or more serious complications.<\/p>\n 4. Painkillers<\/p>\n Some over-the-counter painkillers<\/a>, such as those containing aspirin or paracetamol, include added caffeine.\u00a0Coffee can speed up<\/a>\u00a0how quickly these drugs are absorbed by accelerating how fast the stomach empties and making the\u00a0stomach more acidic<\/a>, which improves absorption for some medications such as aspirin.<\/p>\n While this may help painkillers work faster, it could also raise the risk of side-effects like stomach irritation or bleeding, especially when combined with other sources of caffeine. Though no serious cases have been reported, caution is still advised.<\/p>\n 5. Heart Medications<\/p>\n Caffeine can temporarily raise blood pressure and heart rate<\/a>, typically lasting three-to-four hours after consumption. For people taking blood pressure medication or drugs that control irregular heart rhythms (arrhythmias), this\u00a0may counteract<\/a>\u00a0the intended effects of the medication.<\/p>\n This doesn\u2019t mean people with heart conditions must avoid coffee altogether \u2013 but they should monitor how it affects their symptoms, and consider limiting intake or switching to decaf if needed.<\/p>\n What Can You Do?<\/p>\n Coffee may be part of your daily routine<\/a>, but it\u2019s also a potent chemical compound that can influence how your body processes medicine. Here\u2019s how to make sure it doesn\u2019t interfere.<\/p>\n Take levothyroxine or bisphosphonates on an empty stomach with water, and wait 30-60 minutes before drinking coffee or eating breakfast.<\/p>\n Be cautious with cold and flu remedies, asthma treatments and ADHD medications, as caffeine can amplify side-effects.<\/p>\n If you\u2019re on antidepressants, antipsychotics, or blood pressure drugs, discuss your caffeine habits with your doctor.<\/p>\n Consider reducing intake or choosing a decaffeinated option if you experience side-effects like restlessness, insomnia or heart palpitations.<\/p>\n Everyone metabolizes caffeine<\/a> differently \u2013 some people feel fine after three cups, while others get side-effects after just one. Pay attention to how your body responds and talk to your pharmacist or GP if anything feels off.<\/p>\n If you\u2019re ever unsure whether your medicine and your coffee are a good match, ask your pharmacist or doctor. A short conversation might save you weeks of side-effects or reduced treatment effectiveness \u2013 and help you enjoy your brew with peace of mind.<\/p>\n Dipa Kamdar<\/a>, Senior Lecturer in Pharmacy Practice, Kingston University<\/a>. She does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.<\/p>\n This article is republished from The Conversation<\/a> under a Creative Commons license. Read the original article<\/a>.<\/p>\n![\"The](\"https:\/\/www.europesays.com\/uk\/wp-content\/uploads\/2025\/06\/1749033789_530_count.gif\"\/)
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