sentences:  Side effects may include a lump at the injection site (injection site reaction) in approximately 30% of users, and aches, fever, chills (flu-like symptoms) in approximately 10% of users.Side effect symptoms are generally mild in nature.A reaction that involves flushing, shortness in breath, anxiety and rapid heartbeat has been reported soon after injection in up to 5% of patients (usually after injecting directly into a vein).