Infusion is generally used for chemotherapy, a term used to describe the treatment of cancer with medications that kill cancer cells and help prevent them from multiplying in your body. Depending on your disease and treatment plan, chemotherapy is delivered while you are on an inpatient or outpatient basis. Infusion means that the medication enters your bloodstream through a needle in your vein or another device. You will receive your treatment in a reclining chair or bed. Depending on your treatment plan, your sessions will usually last between one and several hours and are given at one- to three-week intervals. Free snacks and lunch are available for patients in the outpatient infusion units. You might receive other medications or blood products through infusion, just as you might receive chemotherapy by other methods, such as in pill form.