The standard prophylaxis for post-endoscopic retrograde cholangiopancreatography pancreatitis (PEP) is performed with rectal non-steroidal anti-inflammatory drugs (NSAIDs). A recent Japanese study demonstrated the efficacy of irrigating the periampullary region with ice water, however without the concomitant use of NSAIDs. The proposed study is a randomized, single-center, single-blind clinical trial that aims to compare the efficacy of rectal NSAIDs alone versus NSAIDs associated with ice water in the prevention of PEP.