Victoza is a medicine approved to treat patients with type 2 diabetes, but there are clinical studies that demonstrate its effectiveness for weight loss. Victoza contains the active substance liraglutide and comes in pre-filled pen injectors. Victoza can be administered as a weight loss aid when you have a BMI of 28 or higher. The active substance, liraglutide, slows down the passage of food through the stomach. The feeling of satiety manifests earlier and lasts longer, so you eat less. When combined with proper physical exercise, it helps you lose weight faster.