The aim of this study is to evaluate the role of ondansetron lozenge on prevention of postoperative nausea and vomiting (PONV) in pediatrics undergoing squint surgeries.

Post-operative nausea and vomiting (PONV) are two of the most common and distressing complications related to surgery and anesthesia.

In several studies PONV occurred in 13% to 42% of pediatric surgical patients, while severe cases are less common, occurring in 1-3% of patients. Volatile anesthetics are the main cause in the early post-operative period (0-2 h), with dose-response relationship. In the delayed post-operative period (2-24 h) the main predictors are childhood, PONV in the early period, and the use of postoperative opioids.

Ondansetron is generally considered to be the first-line antiemetic for patients because of its favorable side effect profile. Ondansetron reduces the activity of the vagus nerve, which deactivates the vomiting center in the medulla oblongata, and also blocks serotonin receptors in the chemoreceptor trigger zone, Ondansetron is an effective drug in the prevention and treatment of PONV by having low side effects.

Inclusion Criteria:

• Age from 4 to 15 years.
• American Society of Anesthesiology (ASA) physical status I, II.
• Pediatric patients undergoing squint surgeries.

Exclusion Criteria:

• Patients who had received any medication with antiemetic properties within 24 h before surgery.
• Post-operative period (for reasons other than rescue antiemetic therapy).
• Patients with known liver or renal disease.
• Patients with a history of vomiting or retching within 24 h before surgery.

The data will be available upon a reasonable request from the corresponding author after the end of study for one year.

After the end of study for one year.

The data will be available upon a reasonable request from the corresponding author.