intravenous

Explanation

"Intravenous means ‘within the vein’. It is the infusion of liquid directly into a vein using a syringe or intravenous catheter (tube). Compared with other routes of administration, the intravenous route is the fastest way to deliver fluids and medicines into the blood stream (the systemic circulation). In intravenous therapy, the bioavailability of the medication is 100%."