What initial action can help an individual who has fainted?

Elevating the legs is an effective initial action for someone who has fainted because it helps to increase blood flow back to the heart and brain. When a person faints, it's often due to a temporary drop in blood flow to these areas, so elevating the legs can assist in restoring circulation and help the individual recover more quickly. This position promotes venous return and can mitigate symptoms of light-headedness and dizziness.

While there are other supportive measures that can be taken based on the individual's condition, such as providing water for hydration or administering oxygen if someone has difficulty breathing, the immediate focus should be on ensuring adequate blood flow by elevating the legs. Glucagon, on the other hand, is used for severe hypoglycemia and would not be appropriate in a general fainting scenario unless the individual has a known history of diabetes and low blood sugar.