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Annual Mugwort Side Effects | Artemisia annua

Annual mugwort (Artemisia annua) can cause side effects such as nausea, dizziness, and allergic reactions. Learn what to watch out for before use.

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Annual mugwort (Artemisia annua) can cause side effects such as nausea, dizziness, and allergic reactions. Learn what to watch out for before use.

What is Annual Mugwort (Artemisia annua)?

Annual mugwort (Latin: Artemisia annua), also known as sweet wormwood, is a medicinal plant from the daisy family (Asteraceae), originally native to Asia. It is best known for its active compound artemisinin, which is widely used in modern medicine for the treatment of malaria. The plant has also been used for centuries in Traditional Chinese Medicine (TCM) and is increasingly popular in Western countries as a herbal supplement, tea, or extract.

Side Effects of Annual Mugwort

Although annual mugwort is considered a medicinal plant, it is not free of side effects. These can vary depending on the form of administration (tea, extract, capsules), dosage, and individual sensitivity.

Common Side Effects

Gastrointestinal complaints: Nausea, vomiting, diarrhea, stomach pain, and loss of appetite are among the most frequently reported adverse effects.
Dizziness and headaches: Especially at higher doses, dizziness, lightheadedness, and headaches may occur.
Cardiac effects: Artemisinin and its derivatives can, in rare cases, affect heart rate and potentially cause cardiac arrhythmias.
Elevated liver enzymes: Prolonged or high-dose use may raise liver enzyme levels and, in rare cases, lead to liver damage.

Allergic Reactions

Since Artemisia annua belongs to the daisy family (Asteraceae), individuals with a known allergy to daisy family plants (e.g., chamomile, marigold, or ragweed) are at higher risk of allergic reactions. These may include:

Skin rash, redness, or itching
Urticaria (hives)
Asthma attacks or difficulty breathing
In very rare cases: anaphylactic shock

Neurological Side Effects

In cases of high-dose preparations or long-term use, neurological symptoms such as tinnitus (ringing in the ears), balance disturbances, and in very rare cases neurotoxic effects have been reported.

Drug Interactions

Annual mugwort may interact with various medications:

Blood thinners (e.g., warfarin): Artemisia annua may enhance anticoagulant effects and increase the risk of bleeding.
Immunosuppressants: Possible interference with the efficacy of immunosuppressive therapies.
Antimalarial drugs: Caution is advised when taken alongside other antimalarial medications.
CYP450 enzymes: Artemisinin influences certain liver enzymes (CYP450), which can alter the metabolism of other drugs.

Risk Groups and Contraindications

For certain groups of people, the use of annual mugwort requires particular caution:

Pregnant and breastfeeding women: Use is not recommended, as artemisinin may have embryotoxic properties and can pass into breast milk.
Children and adolescents: Safety has not been sufficiently established for children under 12 years of age.
Individuals with liver disease: Increased risk of hepatotoxic effects.
Individuals with heart conditions or arrhythmias: Due to possible cardiovascular side effects.
Individuals with daisy family allergies: Increased risk of allergic reactions.

Important Usage Notes

Annual mugwort should only be taken after consulting a qualified healthcare professional. Self-medication, especially with high-dose extracts or capsules, carries significant risks. Key points to keep in mind:

Do not attempt to self-treat serious conditions such as malaria or cancer without medical supervision.
Pay attention to the quality and origin of products, as artemisinin content can vary considerably.
Do not exceed the recommended dosage.
At the first signs of side effects, discontinue use immediately and seek medical advice.

References

World Health Organization (WHO): Guidelines for the Treatment of Malaria, 3rd edition, Geneva 2015. Available at: https://www.who.int/malaria
European Medicines Agency (EMA): Assessment Report on Artemisia annua L., herba, EMA/HMPC/456092/2016, London 2018.
Efferth T. et al.: Toxicity of the antimalarial artemisinin and its derivatives. Progress in Drug Research, 2007; 64:385-422. PubMed PMID: 17195490.

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