Blood in your stool is rarely "normal."  It is likely the herbal antihelmenthic or parasitic preparation has irritated the lining of the small intestine and/or colon (which may detach the parasites)  and caused bleeding.  Depending upon the course of treatment, please consult a health care practitioner if the blood does not go away, once you have stopped the herbal treatment.

Dr.Karen Benton                                       www.countrydoc.com