A Study to Evaluate the Efficacy and Safety of Sitagliptin and MK0431A in Comparison to a Commonly Used Medication in Patients With Type 2 Diabetes (0431-068)(COMPLETED)

sitagliptin 100 mg tablet q.d. orally for a 12-wk treatment period

sitagliptin/metformin HCl (Sita/Met) 50/500 mg b.i.d. orally and then 50/1000 mg b.i.d. orally for a 28-wk treatment period

pioglitazone 15 mg tablet q.d. orally for 6 weeks, followed by 30 mg q.d orally for 6 weeks, followed by 45 mg q.d. orally, up to 40 weeks.

"matching placebo to pioglitazone tablet q.d. orally, for a 40-wk treatment period.~Participants were administered matching placebo the 15 mg pioglitazone q.d. orally for 6 weeks, followed by matching placebo to 30 mg pioglitazone q.d orally for 6 weeks, followed by matching placebo to 45 mg pioglitazone q.d. orally, up to 40 weeks."

matching placebo to sitagliptin q.d., orally for a 12-wk treatment period.

matching placebo to Sita/Met FDC - 50/500 mg b.i.d. for 4 weeks and then 50/1000 mg b.i.d. orally for a 28-wk treatment period (Week 12 to Week 40).