Figure 3From: Rhinorrhea, cough and fatigue in patients taking sitagliptinCase 1. Increased dyspnea was noted while on sitagliptin (week 0). Peak flows increased rapidly within several days of stopping the drug. Restarting sitagliptin after 2 1/2 weeks led to a progressive, 30% decline in PEFR. PEFR again returned to her usual after stopping the drug (weeks 5 and 6).Back to article page