What is Wegovy ™?. Wegovy ™ (semaglutide) injection 2.4 mg is an injectable prescription medicine used for adults with obesity (BMI ≥30) or overweight (excess weight) (BMI ≥27) who also have weight-related medical problems to help them lose weight and keep the weight off.. Wegovy ™ should be used with a reduced calorie meal plan and increased physical activity..