Food containing tyramine can trigger a dangerous rise in blood pressure for people taking certain monoamine oxidase inhibitors (MAOIs). But there is no single food list that applies to every MAOI: the medicine, dose and food’s age or preparation all matter. Use the guidance for your specific prescription, and check with your pharmacist before making broad changes to your diet.
Why Tyramine Can Interact With Some MAOIs
Tyramine occurs naturally in food. Normally, enzymes including monoamine oxidase help break it down. Some MAOIs reduce that breakdown, allowing tyramine to prompt the release of norepinephrine, which can raise blood pressure. A large rise can become a medical emergency.
This interaction is especially relevant to classic MAOIs such as phenelzine, tranylcypromine and isocarboxazid, and to higher doses of oral or transdermal selegiline. The degree of dietary precaution depends on the drug and dose; a restriction for one medicine should not automatically be applied to another. Follow your own medication guide or prescriber’s instructions, including how long to continue precautions if you stop treatment. That period can extend beyond the last dose and differs by medicine.
Food Containing Tyramine: Categories To Check
Tyramine tends to build up as foods age, ferment or spoil. Examples that may appear on MAOI food guidance include aged cheeses; cured, fermented or smoked meats and fish; fermented soy foods such as miso; and yeast extracts. Some guidance also flags certain alcoholic drinks, including tap beer or fermented wines. These are categories to check against your personal instructions, not a universal list of foods every MAOI user must avoid.
Freshness and storage matter too. Food that is past its best or has been stored poorly may be a concern. Choose fresh food and avoid anything whose freshness is doubtful if your medication guidance advises this. Do not assume that every food in a category contains the same amount of tyramine, or that a familiar product is safe simply because another version was allowed.
Why MAOI Food Lists Differ
Tyramine levels can vary widely within the same type of food, depending on production, fermentation, aging and storage. A 2022 review by Vincent Van den Eynde, Peter Kenneth Gillman and Barry Blackwell discusses dietary precautions for classic MAOIs and high-dose selegiline. It notes that modern food production and hygiene have reduced tyramine in many foods, while stressing that variation between products makes exact food tables imprecise. People can also differ in their response.
That helps explain why one leaflet may name a long list of foods while another focuses on avoiding foods with significant tyramine. For example, a U.S. prescribing label for tranylcypromine warns against significant tyramine intake; a UK NHS diet sheet gives more detailed food examples. These are guidance for particular settings and medicines, not proof that one country’s list works for every product or prescription elsewhere. Brand names, recipes and local food practices also differ.
Rather than combining lists from different websites, check the medication guide supplied with your prescription and ask your pharmacist to clarify foods that are part of your usual diet. If your dose changes, confirm whether your food precautions should change too. Do not start a restrictive diet or stop your MAOI based on a general list.
What To Do If You Suspect A Reaction
A suspected tyramine reaction may involve a severe headache, sweating, dizziness or lightheadedness, flushing, a pounding heartbeat, nausea or vomiting, neck stiffness, or chest pain. These symptoms can have other causes, but a sudden or severe reaction while taking an MAOI needs urgent attention. Call your local emergency number for severe symptoms, especially chest pain or a severe headache; do not wait to see whether they pass. Tell responders the name and dose of your medicine and what you ate or drank. For less severe concerns, contact your prescriber or pharmacist promptly for advice.
Your safest food plan is the one matched to your exact medicine and dose. Keep its medication guide accessible, and ask your pharmacist before relying on a general MAOI diet sheet—particularly when travelling or trying unfamiliar fermented or aged foods.