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Peppermint
Peppermint — what the European monograph actually supports, what it is not for, the form and how long it is meant to be used, side effects, and the 1 medicine interaction documented for it.
This is a reference page, not a diagnosis and not a prescription. Herbal products are real pharmacology: they have effects, side effects and interactions with medicines. Tell your doctor and your pharmacist everything you take, including teas and supplements, and never stop or change a prescribed medicine because of anything you read here.
What it is
Mentha × piperita L. — leaf and essential oil (Menthae piperitae folium, Menthae piperitae aetheroleum)
Local names across the region this site serves: piparmünt (ET) · piparminttu (FI) · мята перечная (RU).
Grouped here under Digestion, bloating and the bowel. Regulatory position: EU herbal monograph — well-established use for peppermint oil in gastro-resistant capsules; traditional use for the leaf.
What the evidence supports
The registered indication: Symptomatic relief of minor spasms of the gastrointestinal tract, flatulence and abdominal pain, especially in irritable bowel syndrome, for gastro-resistant oil capsules; the leaf is registered for mild digestive complaints.
The tea and the capsule are two different medicines and conflating them is the commonest mistake made about this plant. Peppermint oil relaxes gastrointestinal smooth muscle, and meta-analyses of randomised trials support enteric-coated — "gastro-resistant" — capsules for the abdominal pain and cramping of irritable bowel syndrome. The coating is the entire point of the design: it carries the oil past the stomach so it releases in the intestine. Swallow peppermint oil without that coating and it relaxes the sphincter at the top of the stomach instead, which is exactly why heartburn is the classic side effect. Peppermint leaf tea is a pleasant carminative with a traditional-use registration and none of that trial evidence behind it.
A — Recognised efficacy A European Union herbal monograph carries a well-established-use indication for a defined preparation, meaning the regulator accepted clinical evidence.
What it is not for
Reflux and heartburn, which it can make worse rather than better. New or changed bowel symptoms, blood in the stool, unexplained weight loss or a first episode over the age of 50 need investigation before any irritable-bowel label is accepted.
Form, strength and how long
Gastro-resistant oil capsules, plain oil, leaf tea, and topical oil preparations for tension headache. Only the gastro-resistant capsule is the preparation the irritable-bowel evidence concerns.
Duration. Capsule courses are typically taken over some weeks; symptoms that do not settle, or that change in character, are a reason to be seen.
No gram figure appears on this page on purpose. The plant part, the extraction solvent and the drug-to-extract ratio together define a preparation, and a number taken from one does not describe another. The reasoning is set out on the hub; the amount that applies to you is the one printed on the pack you are holding, and a pharmacist will read it with you.
Side effects
Heartburn is the common one. Anal burning during flare-ups of loose stool, nausea, and allergic reactions occur. Undiluted oil is irritant to skin and mucous membranes.
Who should avoid it
Monograph texts contraindicate the oil in bile-duct obstruction, gallbladder inflammation and severe liver disease. Menthol-containing preparations must not be applied to the face or nose of infants and small children — it can trigger laryngospasm.
Interactions with medicines
| Medicine or substance | What is described |
|---|---|
| Antacids and acid-reducing medicines | Taking an antacid, a proton-pump inhibitor or another acid-reducing medicine at the same time as a gastro-resistant capsule can raise stomach pH enough to dissolve the coating early, releasing the oil where it is not wanted. Separate them by at least two hours — this is standard label advice, not a theoretical concern. |
The reverse view — start from the medicine rather than the plant — is in the medicine, food and alcohol interactions reference, and summarised for every herb on this site.
As a food
This one is also in the kitchen, so the nutrition figures are worth having next to the pharmacology: see the food data page for calories and nutrients per 100 g and per portion. Culinary amounts and medicinal preparations are different exposures, and the difference is usually the whole safety story.
Sources: European Medicines Agency — Committee on Herbal Medicinal Products (HMPC), European Union herbal monographs · NIH National Center for Complementary and Integrative Health — herb fact sheets · checked 2026-09-06
Frequently asked questions
What is peppermint used for?
Symptomatic relief of minor spasms of the gastrointestinal tract, flatulence and abdominal pain, especially in irritable bowel syndrome, for gastro-resistant oil capsules; the leaf is registered for mild digestive complaints. The tea and the capsule are two different medicines and conflating them is the commonest mistake made about this plant. Peppermint oil relaxes gastrointestinal smooth muscle, and meta-analyses of randomised trials support enteric-coated — "gastro-resistant" — capsules for the abdominal pain and cramping of irritable bowel syndrome. The coating is the entire point of the design: it carries the oil past the stomach so it releases in the intestine. Swallow peppermint oil without that coating and it relaxes the sphincter at the top of the stomach instead, which is exactly why heartburn is the classic side effect. Peppermint leaf tea is a pleasant carminative with a traditional-use registration and none of that trial evidence behind it.
Does peppermint work?
Graded A here: A European Union herbal monograph carries a well-established-use indication for a defined preparation, meaning the regulator accepted clinical evidence. Reflux and heartburn, which it can make worse rather than better. New or changed bowel symptoms, blood in the stool, unexplained weight loss or a first episode over the age of 50 need investigation before any irritable-bowel label is accepted.
How much peppermint should I take?
This reference does not print gram figures, because they do not transfer between preparations of different extract strength. What can be said honestly is the form and the duration: Gastro-resistant oil capsules, plain oil, leaf tea, and topical oil preparations for tension headache. Only the gastro-resistant capsule is the preparation the irritable-bowel evidence concerns. Capsule courses are typically taken over some weeks; symptoms that do not settle, or that change in character, are a reason to be seen.
What are the side effects of peppermint?
Heartburn is the common one. Anal burning during flare-ups of loose stool, nausea, and allergic reactions occur. Undiluted oil is irritant to skin and mucous membranes.
Does peppermint interact with medicines?
Yes — documented for Antacids, PPIs. Each one is described on this page, with a link to the medicine-side reference where one exists.
Others in digestion, bloating and the bowel
Caraway
Mild spasmodic gastrointestinal complaints including bloating and flatulence.
Ginger
Prevention of nausea and vomiting in motion sickness, and mild digestive complaints such as bloating.
Fennel
Mild spasmodic gastrointestinal complaints including bloating and flatulence; and as an expectorant in cough associated with a cold.
Turmeric
Relief of digestive disturbances such as a feeling of fullness and flatulence.
Liquorice
Digestive complaints including burning sensation and dyspepsia; and as an expectorant in cough associated with a cold.
Milk thistle
Relief of digestive complaints, including a feeling of fullness and indigestion.
Keep the whole list in one place
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