It has been found that some herbal preparations can have adverse impact on various haemodynamics of a person during surgery. The herbal preparations can speed up or slow down the heart rate, inhibit blood clotting, alter the immune system and change the effects and duration of anaesthesia.
Scientists have found some preparations have an impact if taken up to a week before a patient goes under the knife.
The herbs that have been studied are echinacea, gingko biloba, garlic, St John's wort and valerian.
Between 1993 and 1998 a total of 2,621 adverse reactions, including 101 deaths, were reported to the United States Food and Drug Administration.
The American Society of Anesthesiologists has recognised the potential for adverse reactions and suggests that patients stop taking all herbal medications two weeks before surgery.
Warning on Herbs used by Diabetics |