Indications
Foeniculum vulgare (fennel) is a herb whose seeds and seed water have been used for centuries in Unani, Ayurvedic and home remedies. Preparations made from fennel, such as distilled fennel water (arq), powders and syrups, are traditionally used for:
- Indigestion, bloating and wind (flatulence)
- Mild stomach cramps and colic
- Loss of appetite
- Mild cough, as a soothing ingredient in some herbal mixtures
Scientific evidence for these uses is limited, and fennel products should not be used in place of medical treatment for a serious illness.
How It Works
Fennel seeds contain a fragrant oil rich in anethole and fenchone. These substances are thought to relax the smooth muscle of the gut, help gas pass more easily and give a mild warming, settling effect on the stomach. Fennel also has a pleasant taste, which is why it is often added to other herbal medicines.
Dosage and Administration
Use as directed on the label or by a registered Unani or Ayurvedic practitioner. Strength differs a lot between distilled water, powders and syrups, so do not switch between products without checking the dose. Fennel preparations are usually taken after meals. Do not give fennel products to infants unless a doctor advises it.
Interactions
Fennel may reduce the absorption of Ciprofloxacin and similar antibiotics if taken at the same time, so keep a gap of at least 2 hours. Because fennel contains plant compounds with weak oestrogen-like activity, check with a doctor if you take hormonal medicines such as oral contraceptives, hormone replacement therapy or Tamoxifen. Tell your doctor about any herbal product you use.
Contraindications
- Allergy to fennel or related plants such as celery, carrot, coriander, cumin or dill
- Hormone-sensitive conditions such as breast, uterine or ovarian cancer or endometriosis, unless a doctor agrees
Side Effects
Fennel is usually well tolerated in the amounts used in food and traditional preparations. Possible side effects include:
- Allergic skin rash or itching
- Mild stomach upset or nausea
- Increased sensitivity of the skin to sunlight (rare)
Get urgent medical help if you notice swelling of the face, lips or throat, difficulty breathing, or a severe rash after using a fennel product.
Pregnancy and Lactation
Small amounts of fennel used in cooking are generally considered acceptable. Concentrated fennel medicines are not recommended in pregnancy without a doctor’s advice. Fennel is sometimes used to support breast milk, but there have been rare reports of problems in babies, so breastfeeding mothers should ask a doctor before using fennel medicines regularly.
Precautions and Warnings
- Do not use for long periods without advice.
- See a doctor if stomach pain is severe, keeps coming back, or comes with fever, vomiting, blood in the stool or weight loss.
- Some syrups contain sugar: people with diabetes should check the label.
- Buy herbal products from a reliable source to avoid contamination.
Overdose
Very large amounts of fennel oil can cause nausea, vomiting and, rarely, fits or breathing problems. If someone has taken much more than the label dose, especially a child, seek medical help straight away and take the pack with you.
Therapeutic Class
Unani herbal preparation (carminative, digestive aid)
Storage
Store below 30°C in a dry place, away from light and out of the reach of children. Keep bottles tightly closed.
Prepared by the Oshud Alo team from standard drug references. For information only; always follow your doctor's advice.