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Thyme
Thyme — 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 absence of established medicine interactions 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
Thymus vulgaris L. and T. zygis L. — herb (Thymi herba)
Local names across the region this site serves: aed-liivatee (ET) · timjami (FI) · тимьян (RU).
Grouped here under Colds, cough and throat. Regulatory position: EU herbal monograph — traditional use.
What the evidence supports
The registered indication: As an expectorant in cough associated with a cold.
Thyme syrups and cough teas are traditional-use registered across the EU, and it is worth translating what the indication actually claims. "Expectorant" means helping a productive cough shift what is there. It does not mean stopping the cough, shortening the illness, or treating an infection. The kitchen jar and the pharmacy preparation are the same species. Thymol, thyme's main essential-oil constituent, is a real disinfectant used in mouthwashes and dental preparations, and that is where the plant's antibacterial reputation comes from — but antibacterial activity in a laboratory dish is not evidence that a cough tea treats a chest infection, and treating those two facts as one is the mistake this page exists to prevent.
C — Traditional use only Plausible from thirty or more years of use, which is what a traditional-use registration means. No clinical evidence was required and none has settled it.
What it is not for
A cough with high fever, breathlessness, chest pain or coughed-up blood, a cough lasting more than about three weeks, or any cough in a person with a chronic lung condition that is behaving differently. Those need assessment.
Form, strength and how long
Dried herb as an infusion, syrups, tinctures and liquid extracts, usually blended with ivy leaf, primrose root or liquorice. Thyme essential oil is a concentrated product for external and inhalational use.
Duration. Short-term use over the course of a cold; monograph texts direct people to seek advice if the cough persists beyond about a week.
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
Stomach upset and allergic reactions, including cross-reaction with other mint-family (Lamiaceae) herbs and, in some people, with birch and celery pollen. Undiluted thyme oil is irritant to skin and mucous membranes.
Who should avoid it
Essential-oil preparations are not for the face of infants and small children. Not established in pregnancy for medicinal amounts; culinary thyme is a food.
Interactions with medicines
No clinically important medicine interactions are established for this herb at culinary or tea amounts. That is not a guarantee — it means nothing has been characterised well enough to state. Concentrated extracts are a different exposure from a cup of tea, and the standing rule still applies: tell your pharmacist what you take.
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 · checked 2026-09-06
Frequently asked questions
What is thyme used for?
As an expectorant in cough associated with a cold. Thyme syrups and cough teas are traditional-use registered across the EU, and it is worth translating what the indication actually claims. "Expectorant" means helping a productive cough shift what is there. It does not mean stopping the cough, shortening the illness, or treating an infection. The kitchen jar and the pharmacy preparation are the same species. Thymol, thyme's main essential-oil constituent, is a real disinfectant used in mouthwashes and dental preparations, and that is where the plant's antibacterial reputation comes from — but antibacterial activity in a laboratory dish is not evidence that a cough tea treats a chest infection, and treating those two facts as one is the mistake this page exists to prevent.
Does thyme work?
Graded C here: Plausible from thirty or more years of use, which is what a traditional-use registration means. No clinical evidence was required and none has settled it. A cough with high fever, breathlessness, chest pain or coughed-up blood, a cough lasting more than about three weeks, or any cough in a person with a chronic lung condition that is behaving differently. Those need assessment.
How much thyme 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: Dried herb as an infusion, syrups, tinctures and liquid extracts, usually blended with ivy leaf, primrose root or liquorice. Thyme essential oil is a concentrated product for external and inhalational use. Short-term use over the course of a cold; monograph texts direct people to seek advice if the cough persists beyond about a week.
What are the side effects of thyme?
Stomach upset and allergic reactions, including cross-reaction with other mint-family (Lamiaceae) herbs and, in some people, with birch and celery pollen. Undiluted thyme oil is irritant to skin and mucous membranes.
Does thyme interact with medicines?
No clinically important medicine interactions are established for it, which is not the same as none existing. Tell your pharmacist what you take.
Others in colds, cough and throat
Echinacea
Short-term prevention and treatment of the common cold.
Elder / elderberry
Relief of early symptoms of the common cold, for elderflower preparations.
Sage
As a gargle or mouth rinse for minor inflammations of the mouth and throat; orally for mild dyspepsia and for excessive sweating.
Keep the whole list in one place
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