I switched from lantus to novolog and the doses are different, I then switched to the 70/30
novolin (relion brand from wal mart) as it was much cheaper and the dose once again changed, although I am type 2 and monitor my levels closely, all insulin brands work differently so be careful and consult Dr.
I did finally settle on the 70/30 mix, you can get the pens but it is much cheaper to just inject yourself, I get the needles that are the same size as the pens.....