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Chamomile tea and lotion causing internal bleeding in patient on anti-coagulant medication

April 28, 2006

MONTREAL-Researchers at the MUHC in Montreal have documented a severe case of internal hemorrhaging in a patient that drank chamomile tea and used chamomile lotion while taking anti-coagulant medication for a heart condition. The 70-year old patient was admitted to the MUHC ER in Montreal after using chamomile to help soothe her sore throat. The case published in the Canadian Medical Association Journal (CMAJ) this week, highlights the need for caution when taking alternative (natural) therapies while on physician prescribed medications.

The patient had been implanted with a mechanical valve and was taking an anti-coagulant medication called warfarin, designed to thin the blood and reduce the chances of stroke. "Warfarin is an effective and reliable anti-coagulant and as a result is used commonly," says Dr. Louise Pilote an internist and epidemiologist at the MUHC and Associate Professor of Medicine at McGill University. "We are aware of several herbal products that should not be taken with warfarin, such as garlic, onion and ginger, but this is the first time we have documented a life-threatening reaction when combined with chamomile."

Warfarin is derived from coumarin, a chemical compound with anti-coagulant properties found in many plants, including chamomile. "It seems the chamomile acted synergistically with the warfarin in this case," says Dr. Pilote. "Although this is a rare case, it highlights the potential dangers of mixing herbal remedies with physician prescribed medications."

Camomile tea is taken to treat a range of ailments including toothache, sore thoats, digestive problems and insomnia-it is known as the night-time tea because it acts as a mild sedative. Camomile lotion is often used to treat skin conditions psoriasis, eczema and acne as well as helping soothe insect bites.

McGill University