DPP-4's S 2 pocket accommodates a wide range of lipophilic rings, with only a slight decrease in effectiveness for very small three-membered or large twelve-membered rings
Half-life is 7 to 34 hours and is, in part, dependent on urine pH (half-life is longer with alkaline urine)

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Standard reconstitution math: if you have a 5 mg (5000 mcg) vial and add 2.5 mL bacteriostatic water, each 0.25 mL (25 unit insulin syringe mark) contains 500 mcg