 Each patient will undergo uni- or bilateral abdominally based free flap harvest, microsurgical anastomoses, and flap inset. Following randomization, the study drug will be sent to the main operating theatre, and attached to the patients medical chart. At the conclusion of surgery, each patient will be administered their first dose of the study drug. Its content will depend on the patients randomized group. If randomized to the ketorolac intervention group, the IV minibag will contain 30 mg of ketorolac tromethamine, or if in the control group it will be a sham normal saline IV minibag. They then will continue to receive their assigned drug every 6 hours for 72 hours. Patients all receive 1:1 care from nursing staff in the early postoperative period, and their nurse will administer all drugs given on the surgical ward. 