WHITEHOUSE STATION, N.J.--(BUSINESS WIRE)--Merck (known as MSD outside the United States and Canada) (NYSE: MRK) today announced that NEXPLANON® (etonogestrel implant) 68 mg, a long-acting, progestin-only single-rod hormonal contraceptive, is now available in the United States. NEXPLANON is approved by the FDA for the prevention of pregnancy in women for up to three years. NEXPLANON must be removed by the end of the third year and may be replaced by a new NEXPLANON, if continued contraceptive protection is desired.