De forskelle, der relaterede til sitagliptin alene, skyldtes primært gastrointestinale bivirkninger.
The overall incidence of adverse reactions considered as drug-related in patients treated with the combination of sitagliptin and metformin was comparable to metformin alone (14.0% each) and greater than sitagliptin alone (6.7%), with the differences relative to sitagliptin alone primarily due to gastrointestinal adverse reactions.