Drug injection

Drug injection is a method of introducing a drug into the bloodstream via a hollow hypodermic needle, which is pierced through the skin into the body (usually intravenously, but also at an intramuscular or subcutaneous location). Intravenous therapy, a form of drug injection, is universally practiced in modernized medical care. 2004, there were 13.2 million people worldwide who (self-administered injection drugs outside of medical supervision)date=December 2020, of which 22% are from developed countries.