Application of butterflybush flower and extract in preparation of medicine for treating pulmonary heart disease

The invention belongs to the technical field of traditional Chinese medicines and specifically relates to application of a natural vegetable drug and/or its extract in the preparation of a medicine for treating pulmonary heart disease. The invention relates to application of butterflybush flower and/or its extract in the preparation of a medicine for treating pulmonary heart disease. The butterflybush flower is flower bud, inflorescence or entire plant of Loganiaceae plant butterflybush flower; and the extract is an extract obtained by extraction or heating reflux or supercritical extraction of crushed butterflybush flower at room temperature. A solvent used for the extraction is a liquid obtained after water and ethanol are mixed according to any ratio, or a liquid obtained after organic solvents such as ether, petroleum ether, chloroform, ethyl acetate and the like are mixed according to any ratio, or liquid CO2. The butterflybush flower and/or its extract can be individually used as a main active component