Introduction.

Postoperative pain is one of the causes of prolonged hospitalization in patients who have previously been classified as outpatients. The general objective of the study was to determine the usefulness of non- steroidal analgesics and dexamethasone in the preventive analgesia modality.

Material and method.

A descriptive study was performed in patients undergoing adeno- tonsillectomy-surgery, who covered the inclusion criteria. The following drugs were administered preventively: ketorolac 60 mg/k/ standard dose, metamizole 30 mg/k and dexamethasone at the rate of 0.200 mg/k. The statistical index used was; "T" Paired, for parametric variables, with p <0.05; And Chi Square (X2), with p <0.05, for the evaluation of pain.

Results.

A total of 62 patients were studied (N = 62), with age: X = 15.85 ± 4 years; Fifty patients were identified as ASA I; And 12 patients as ASA II. It is observed that in 58 patients of the study the pain was controlled without the need of rescue doses, four patients were given rescue doses. Statistical analysis showed statistically significant differences in pain assessment, with the following values: Statistic of X2 = 4.133, with four degrees of freedom, with a critical value of 9.49, with a p <0.05.

Discussion.

The results of our study demonstrate the utility of administering the analgesic drugs described by the method of preventive analgesia, with a quality aggregate that was dexamethasone, which reduced morbidity and shortened the length of hospital stay.

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