What is the difference between a medicinal drug and an herb? Herbs contain a variety of chemical compounds placed there by God. Over the centuries, many have been found to be very extremely useful for physical problems. Medicinal drugs are different. In order to patent them (for exclusive sales and profits), medicinal drugs cannot have the exact formulas found in herbs. Instead, they contain various man-made combinations of chemicals. Because of this, to one extent or another, they are always poisonous. Their “contraindications” paragraphs verify the fact. The liver, kidney, and other organs frequently suffer from them.