Boxed warning (risk of complications due to improper insertion and removal): Improper insertion of NEXPLANON increases the risk of complications. Proper training prior to first use of NEXPLANON can minimize the risk of improper NEXPLANON insertion. The following information is based on experience with the etonogestrel implants (IMPLANON and/or NEXPLANON), other progestin-only contraceptives, or experience with combination (estrogen plus progestin) oral contraceptives. Insertion and removal complications: Pain, paresthesia, bleeding, hematoma, scarring, infection, or migration to vasculature, including pulmonary vessels, may occur. Symptoms associated with implants in pulmonary vessels include chest pain, dyspnea, cough, or hemoptysis. Surgical interventions may be necessary to remove implants.