Hello novorapid flexpen whole units and lantus because I have been injecting the right dose of novorapid for meals and corrections if I inject in the gut Cogo fold and in angle of 90 because I put the needle with the dose with the doseCorrect marked tightened the button and I usually wait between 5-10s and sometimes even more with a new needle and starting with a new pen and sometimes also purging the pen 2u and when I take out the needle, 1 or 2 drops stays at the tip andIt is as if I had not put the dose that I marked, ah and before I put the needle I always look if the needle is well fitted and if it is and still n9 I understand because they stay drops but c9n lantus does not happen to me when II put a dose of Lantus, there is not a drop in the needle and I don't know what I do badWe ask for insulin box always comes some defective pen, ah and I also say that the pen I started new to see if I had bubbles and n9 had none and the color was transparent per9 what I do not understand because with novorapid passes me per9 with lantusNot someone from this forum buys needles from Amazon or Diabetika