The primary objective of this study is to investigate the effect of a short intravenous infusion of erythromycin 3 mg/kg, administered 20 min before intubation on gastric emptying, in adults scheduled for rapid sequence intubation for full stomach. After intubation a gastroscopy will be done to see if there is any content in the stomac. The secondary objective is the assessment of tolerability and safety of a single intravenous dose of preoperative erythromycin in surgical patients.