Infusion - A method of putting fluids, including drugs, into the bloodstream. Also called intravenous infusion. This Is done In your physician's Infusion suite by an Infusion nurse In a safe environment. The frequency will be determined by your physician.
Injection - A way of administering a sterile liquid form of medication into tissues of the body beneath the skin or in a muscle, using a sharp, hollow needle or tube.
Both methods are safe and effective.