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Table 1 Badalov classification system of drug-induced acute pancreatitis [5]

From: Updates in drug-induced acute pancreatitis

Class Ia drugs At least 1 case report with positive re-challenge, excluding all other causes, such as alcohol, hypertriglyceridemia, gallstones, and other drugs
Class Ib drugs At least 1 case report with positive re-challenge, however, other causes, such as alcohol, hypertriglyceridemia, gallstones, and other drugs were not ruled out
Class II drugs At least 4 cases in the literature and consistent latency in at least 75% of cases
Class III drugs At least 2 cases in the literature with neither consistent latency among cases nor re-challenge
Class IV drugs Like class III drugs, but only one case report had been published, without re-challenge