Safety/Efficacy of Sitagliptin in Patient w/ Type 2 Diabetes (0431-801)

Sitagliptin 100 mg administered as one oral tablet once daily in the morning for up to 18 weeks.

Rosiglitazone 8 mg administered as two 4 mg capsules once daily in the morning for up to 18 weeks.

placebo - administered as one placebo tablet to match Sitagliptin 100 mg and two placebo capsules to match rosiglitazone 4 mg once daily in the morning for up to 18 weeks.

Open-label metformin was supplied by the Sponsor as 500, 850, or 1000 mg oral tablets administered at a daily dose of \>= 1500 mg.