 This study will be conducted as a prospective, randomized, longitudinal, double-blinded trial at a single ambulatory surgery centre with 3 groups of 20 children. Group 1 will receive oral acetaminophen 15 mgkg 1 hour pre-operatively and high-dose intravenous dexamethasone 0.5 mgkg, max. dose 10 mg immediately after induction of anesthesia. Group 2 will receive oral acetaminophen elixir 15 mgkg 1 hour pre-operatively and low-dose intravenous dexamethasone 0.15 mgkg, maximum of 8 mg immediately after induction of anesthesia. Group 3 will receive an oral placebo 1 hour pre-operatively and low dose intravenous dexamethasone 0.15 mgkg, maximum of 8 mg immediately after induction of anesthesia. Dose of dexamethasone is a potential confounder if patients in the low-dose dexamethasone groups weigh enough to obtain the maximum dose 8 mg. We expect this occurrence to be rare, as dexamethasone will be dosed for ideal bodyweight, but subgroup analysis by actual dose received will be performed to compare the two dosing regimens 0.15mgkg and 0.5 mgkg. 