“…Neither linagliptin nor sitagliptin, which was responsible for 4 cases of DPP-4 inhibitor-associated BP in the literature [5,8,9], showed such adverse reactions in preclinical studies [17,18]. A review of sitagliptin-related adverse event reports from the United States Food and Drug Administration database between October 2006 and November 2008 [19] describes 2 cases of Stevens-Johnson syndrome, 2 cases of toxic epidermal necrolysis, and 22 cases of ‘bullous, desquamative, blistering, exfoliative, urticarial, or exanthematous skin reactions'. According to the referred article, no additional efforts have been made to further differentiate these skin reactions.…”