It works by acting on brain receptors that control the appetite. This causes you to feel fuller and hence, less hungry, which in turn helps to lower food intake. Saxenda is a once a day injectable and you can opt to inject it at your most convenient time – before breakfast, lunch, dinner or bedtime. But do so at approximately the same time each day. The areas it can be injected into include the stomach, thigh or upper arm. The doctor will advise in regards.