UPDATE (April 2, 2013): Before you take Byetta, Victoza, Onglyza, or Januvia please read about the new research that shows that they, and probably all incretin drugs, cause severely abnormal cell growth in the pancreas and precancerous tumors. You'll find that information HERE.
NEW Dec 19, 2008: If you want to better understand the health issues associated with Januvia, read the Dec 8, 2008