Tonsillectomy is the most common surgery in children. Post-tonsillectomy
pain is universal and associated with considerable morbidity. Dipyrone
is banned in some countries and the analgesic most commonly used in
others. Evidence of the effectiveness of dipyrone in postoperative
analgesia of tonsillectomy are scarce. Serious adverse effects such as
agranulocytosis and anaphylaxis are rare and their incidence varies in
different populations.