For adults who are obese or overweight with weight-related medical problems, Saxenda in NYC & Long Island may be an effective weight-loss solution. Saxenda is an injectable prescription medication used to help patients lose weight and keep that weight off. In addition to adults, Saxenda can be prescribed to children between the ages of 12 and 17 if they have a body weight above 132 lbs. Like most weight-loss medications, Saxenda is meant to be combined with exercise and a healthy diet.