Aggressive intravenous hydration has been shown in randomized trials to prevent post-endoscopic retrograde cholangiopancreatography (ERCP) pancreatitis (PEP), though studied regimens are often impractical. To date, no studies have prospectively assessed short-term (60-90 minute) aggressive hydration regimens that are feasible for outpatients undergoing ERCP and subsequent discharge. Furthermore, little is known with regard to fluid type, volume, and timing with respect to ERCP. In this study, we will aim to assess whether the amount of peri-procedural intravenous fluid administered around the time of ERCP is associated with the risk of PEP (the primary outcome).