Comparison of the Effectiveness of Paracetamol With Ibuprofen or Paracetamol With Metamizole in Treating Pain in Acute Pancreatitis in Children

Inclusion Criteria: * diagnosis of AP according to the INSPPIRE mentioned above criteria, * age from 3 to 18 years of age, * abdominal pain on admission assessed on the Numerical Rating Scale (NRS) or FLACC \>= 4 points, * no analgesic treatment before enrolment in the study OR the last dose of analgesic drug (paracetamol, ibuprofen, metamizole) taken ≥ 6 hours before enrolment for examination, * consent of legal guardians and the child (in the case of patients ≥16 years of age) to participate in the study. Exclusion Criteria - patients: * who took the last dose of painkiller (paracetamol, ibuprofen, metamizole) \< 6 hours before entering the study, * allergic to acetylsalicylic acid, other NSAIDs, paracetamol, metamizole, * with inflammatory bowel disease, * with gastrointestinal bleeding and other active bleeding, * with gastric and/or duodenal ulcer disease, * chronically taking paracetamol, NSAIDs, metamizole, * with liver failure, * with heart failure according to the NYHA II-IV scale, * with acute and chronic renal failure, * with cancer, * whose legal guardians did not consent to participate in the study, * who did not consent to participate in the study (applies to patients \> 16 years of age).