Linagliptin
"I have not had adverse reactions.  I find that it effectively drops my blood sugar significantly and effectively.  I also use metformin but it is the extended release type.  Linagliptin is great as I take it first thing in the morning before breakfast.  Metformin always needs to be taken with food which is not always convenient.  I know people on regular Metformin can become dizzy because their blood sugar went too low without enough food.
To anyone on this medicine, especially for the first month, I would measure blood sugar several times throughout the day to see if your blood sugar dips too low."