This study will explore the efficacies of several practical short-term (peri-procedural) intravenous fluid regimens in the prevention of post- endoscopic retrograde cholangiopancreatography (ERCP) pancreatitis (PEP). PEP is the most common serious ERCP-related adverse event (AE), occurring in 5-15% of patients, and associated with significant morbidity, mortality, and healthcare utilization. Given the current lack of data on effectiveness of short-term fluid regimens in PEP prevention to inform practice, the results of the proposed study have the strong potential to impact ERCP practices worldwide, whether positive or negative.