A growing number of people are turning to herbal teas as a natural and safe option, attributed to their calming properties and potential role in improving digestion, boosting immunity, and aiding sleep. However, this positive perception is not without its hidden health risks. Pharmacy and nutrition experts warn that some common herbs can directly interact with essential medications, potentially weakening their effectiveness or exacerbating their side effects to alarming levels.
Specialists emphasize that herbal teas, despite their generally perceived "gentle" nature, can have real pharmacological effects on the body, requiring extreme caution, especially for individuals taking chronic medications or undergoing sensitive treatments.
Herbs and Medications… Unexpected Interactions
Immunosuppressant Drugs:
Cyclosporin is a vital treatment for preventing organ rejection after transplantation and is also used to treat certain autoimmune diseases. Medical reports indicate that herbs such as St. John's wort and ginger may reduce its effectiveness, increasing the risk of transplant failure. Conversely, other herbs, such as chamomile and echinacea, may increase the concentration of the drug in the blood, potentially causing serious toxic effects.
Blood thinners:
Herbs known for their effect on blood clotting, such as ginger, cinnamon, turmeric, ginkgo, and ginseng, may increase the risk of bleeding when taken concurrently with blood-thinning medications like warfarin, elequis, and xarelto. In other cases, these herbs may reduce the effectiveness of some anticoagulants, increasing the risk of blood clots.
Heart medications:
Digoxin, used to treat heart failure and arrhythmias, is highly sensitive to interactions. Herbs such as St. John's wort, hawthorn, and ginseng may weaken its effect, potentially disrupting heart rhythm and exposing the patient to serious complications.
Antidepressants:
Some herbs, most notably ginseng and St. John's wort, contribute to raising serotonin levels in the blood. When combined with antidepressants, it may cause a condition known as serotonin syndrome, a serious medical condition with symptoms such as rapid heartbeat, confusion, excessive sweating, and fever.
Anxiety medications and sleeping pills:
Combining herbs with a calming effect, such as valerian root, with benzodiazepines may lead to excessive drowsiness or dangerous central nervous system depression, increasing the risk of loss of consciousness or accidents.
Diabetes medications:
Medical data suggests that goldenseal may reduce the effectiveness of metformin, hindering blood sugar control and potentially causing unexpected spikes in blood sugar levels.
Blood pressure medications:
Some herbs containing compounds like berberine may lower blood pressure. When taken with blood pressure-lowering medications, such as losartan, it may cause a dangerous drop in blood pressure or significantly increase side effects.
Medical Warnings and Recommendations
Experts point out that herbs are classified as dietary supplements in many countries, meaning they are not always subject to strict standards regarding quality, purity, or dosage. Therefore, it is recommended to:
- Inform your doctor or pharmacist about all types of herbal teas or supplements you use regularly.
- Avoid concentrated herbal supplements without prior medical consultation.
- Choose reliable products that have undergone accredited laboratory testing.
Expert Summary
Herbal teas may be beneficial in some cases, but they are not always safe when combined with medications. The golden rule agreed upon by specialists remains clear: “Natural does not necessarily mean risk-free.”
