 If you have heart disease and struggle with LDL-C, even with statins and a healthy diet, listen to your heart. Talk to your doctor about Repatha. Repatha plus a statin lowers LDL-C, bad cholesterol, by 63% and drops the risk of having a heart attack. Do not take Repatha if you are allergic to it. Repatha can cause serious allergic reactions. Signs include trouble breathing or swallowing or swelling of the face. Most common side effects include runny nose, sore throat, common cold symptoms, flu or flu-like symptoms, back pain, high blood sugar, and redness, pain, or bruising at the injection site. Talk to your doctor about Repatha.