Intravenous paracetamol and dipyrone for postoperative analgesia after day-case tonsillectomy in children: a prospective, randomized, double blind, placebo controlled study

Braz J Otorhinolaryngol. 2013 Jan-Feb;79(1):89-94. doi: 10.5935/1808-8694.20130015.
[Article in English, Portuguese]


Tonsillectomy is associated with severe postoperative pain for which, several drugs are employed for management.

Objective: In this double-blind, placebo-controlled study we aimed to evaluate the efficacy of intravenous paracetamol and dipyrone when used for post-tonsillectomy analgesia in children.

Method: 120 children aged 3-6 yr, undergoing tonsillectomy with or without adenoidectomy and/or ventilation tube insertion were randomized to receive intraoperative infusions of paracetamol (15 mg/kg), dipyrone (15 mg/kg) or placebo (0.9% NaCl). Evaluation was carried out at 0.25, 0.50, 1, 2, 4, 6h postoperatively. Pethidine 0.25 mg/kg was utilized as rescue analgesic. Cumulative pethidine requirement was the primary outcome. Pain intensity measurement, pain relief, sedation level, nausea and vomiting, postoperative bleeding and any other adverse effects were noted.

Results: No significant difference was found in pethidine requirement between paracetamol and dipyrone groups. Cumulative pethidine requirement was significantly less in paracetamol and dipyrone groups vs. placebo. No significant difference was observed between groups in postoperative pain intensity scores throughout the study.

Conclusion: Intravenous paracetamol is found to have a similar analgesic efficacy as intravenous dipyrone and they both help to reduce the opioid requirement for postoperative analgesia in pediatric day-case tonsillectomy.

Publication types

  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetaminophen / administration & dosage*
  • Analgesics, Opioid / administration & dosage
  • Anti-Inflammatory Agents, Non-Steroidal / administration & dosage*
  • Child
  • Child, Preschool
  • Dipyrone / administration & dosage*
  • Double-Blind Method
  • Female
  • Humans
  • Male
  • Meperidine / administration & dosage
  • Pain Measurement
  • Pain, Postoperative / drug therapy*
  • Prospective Studies
  • Tonsillectomy / methods*
  • Treatment Outcome


  • Analgesics, Opioid
  • Anti-Inflammatory Agents, Non-Steroidal
  • Acetaminophen
  • Dipyrone
  • Meperidine