I Am Researching Worm Dr A Remedy That Contains Quassia

I am researching Worm Dr a remedy that contains Quassia wood, Fresh green walnut hulls, licorice root fresh marshmallow root and bayberry root. I read that it is good for ridding the body of parasites. I tried one dose and had terrible gas for hours. Just wondering if it is not for me or if that was a die off type reaction.