depot injection

The depot injection - An intramuscular injection of a drug that gives a slow, steady release of its active chemicals into the bloodstream. Release of the drug is slowed by the inclusion of substances such as oil or wax, and can be made to last for hours, days, or weeks.

A depot injection can be useful for patients who may not take their medication correctly. It also prevents the necessity of giving a series of injections over a short period. Drugs that may be given by depot injection include hormonal contraceptives (see contraception, hormonal methods of), corticosteroid drugs, and antipsychotic drugs. Side effects may arise due to the uneven release of the drug into the bloodstream.