Foam Sclerotherapy is a varicose treatment where the patient’s blood vessel is injected with foam sclerosant drugs through use of a syringe. The drugs used for this procedure are either Sodium Tetradecyl Sulfate or Polidocanol. During this vein treatment, the drugs are blended together with CO2 and air either inside the syringe or through the use of a mechanical pump. The mixture of drugs, CO2 and air gives the solution a wider reach than what is used in liquid sclerotherapy, because it doesn’t mix with the blood that is inside the vessel. It instead displaces it. Because of this, the drug does not become diluted by the blood and is able to cause the maximum amount of sclerosant action. This makes foam sclerotherapy more effective in treating larger and longer varicose veins.