The intravenous method provides fast and targeted delivery of therapeutic agents to the patient’s body. It (rarely – intra-arterial) is used if the drugs are poorly absorbed by the intestine, noticeably irritate its mucous membrane, quickly decay when passing through the digestive tract.
Stretched in time, the introduction of drugs through infusion ensures their stable concentration in the blood. This is due to the immediate effect of the injected drug, completely reaching the right tissues and receptors.
With intravenous administration, it is possible to dispense the drug accurately; it is possible to deliver large volumes of therapeutic compositions, including irritating mucous membranes. The requirement for such preparations is their complete solubility in water and the absence of damaging effect on the vascular endothelium. However, the risk of side effects with intravenous administration of drugs is greater than with other methods. This method is not suitable for oil, or slightly soluble in water preparations.