The article addresses in a systematized manner some of the most important problems raised in the administrative practice - the cessation of producing of legal effects by the administrative acts. The caducity of the administrative act was not the object of research of some national studies that would highlight the particu-larities its. There are certain institutions of administrative law with which caducity is likely to be confused. Therefore, we briefly review aspects of terminology, doctrinal definitions, the distinction between caducity and repeal, nullity, revocation and inexistence of the administrative act.