PCSK9-IN-10 is a potent and orally active PCSK9 inhibitor with an IC50 value of 6.4 µM. PCSK9-IN-10 increases the expression of LDLR protein and decreases the expression of PCSK9. PCSK9-IN-10 reduces atherosclerosis progression. PCSK9-IN-10 has the potential for the research of hyperlipidemia.