question: who makes this drug and why would i take it, I already take 1000 mg of metforminevery YYYY@YYYY , right now I am taking 1000 mg of metformin twice a day 27 units of lantus, and Glyburide 5mg one in the morning aznd two at supper last a1c aweek ago was 6 4mo ago 7 I don t understand why should I drop glyburide and take glipizide