depends on the herbs. just because certain herbs are not considered medications per se and do not require prescriptions does not mean they do not cause unintentional medical effects drug interactions anesthesia interactions etc. she is having heart surgery. rather than question the reason for "no herbs" it is best to follow the specific instruction given by the surgeon who has her best interests at heart.
why no herbs prior to open heart surgery. my sister-in-laws surgeon told her not to consume herbs prior to her heart surgery. what is the dangers to taking or eating herbs?