[Complications using the laser]

In this paper we analyze the complications of various applications of laser in urology. The search of a minor aggression trying to diminish complications have lead the development of the use of this energy in the most frequent urologic pathologies. Its use in the fragmentation of ureteral stones has modified the therapeutic algorithms. In prostatic diseases we analyze the various options from enucleation (HoLEP) to green laser photovaporization, reviewing the bibliographic references and comparing them with our experience. There are other therapeutic applications that use this energy as a cutting instruments for urethral, ureteral, ureteropyelic junction stenosis, or bladder neck section.