Injection is generally administered as a bolus, but can possibly be used for con ...

... tinuous drug administration as well. [2] The medication may be long-acting even when administered as a bolus and is then called depot injection. Administration by an indwelling catheter is generally preferred instead of injection in case of more long-term or recurrent drug administration.

Injections are among the most common health care procedures, with at least 16 billion administered in developing and transitional countries each year. [3] 95% of injections are administered in curative care, 3% are for immunization, and the rest for other purposes, such as blood transfusions. [3] In some instances the term injection is used synonymously with inoculation even by different workers in the same hospital. This should not cause confusion; The focus is on what is being injected / inoculated, not the terminology of the procedure