The term phytotherapy comes from the Greek „phyton” (= plant) and means "healing with plants." It is based on the finding that the (chemical) substances of a plant or drug are responsible for its healing properties. Unlike a single chemically defined substance, whether of herbal or synthetic-chemical nature, you always have a complex mixture of chemical ingredients in a plant. These attack various targets (receptors, enzymes, membranes, DNA) of cells or tissues in the body (multi-target theory). The effects that occur increase in strength and thus show a demonstrable efficacy overall. The effect of drugs and drug preparations can be described as predominantly moderate, side effects or interactions with other drugs are rare in phytotherapy.