The art of Herbalism is not substituting herbal medicine for pharmaceutical medicine, Herbal medicines do not work in the same manner as pharmaceutical drugs. Often we think "I have a cold so I will take horseradish and garlic instead of panadol or nurofen", or "I have bloating and wind so I will take slipper elm instead of a nexium" and so forth. There is nothing wrong with this and sometimes it works but other times it does not.
But there is a whole philosophy to Herbal medicines that guides the practices and treatment that is missed if you use Herbal Medicines in this way.
My aim here is to help you understand the way Herbal Medicines works within the frame work of herbalism and not just as a substitute for pharmaceutical drugs.