Ultimed pen needles are used for the administration of insulin. Insulin can treat highblood sugarin people with type 1 diabetes mellitus and type 2 diabetes mellitus. Insulin cannot be given by mouth because enzymes in the digestive tract will break it down, so it must be given by injection. When using insulin pens, pen needles are needed to inject the medication. Ultimed pen needles come in different sizes and lengths for injection into subcutaneous tissue. Subcutaneous tissue is the layer of fat between the skin and the muscle cells. Insulin is injected into this tissue and then slowly releases into the bloodstream. Ultimed pen needles will fit most types of insulin pens.