A caffeoylquinic acid-rich extract obtained from Erigeron multiradiatus and a method for producing the same. A caffeoylquinic acid-rich extract includes at least 15% by weight of a mixture of certain caffeoylquinic acids. The extract with the mixture of caffeoylquinic acids is highly efficacious in treating and preventing myocardial ischemia or myocardial ischemia reperfusion injuries. A method for treating or preventing a disease caused by myocardial ischemia or myocardial ischemia reperfusion includes administering a therapeutically effective amount of the caffeoylquinic acid-rich extract to a subject. Pharmaceutical compositions including the caffeoylquinic acid-rich extract are also disclosed.
