How high is your blood sugar? Humalog can also be used to correct high blood sugar, but to do that you need to know your Correction Factor and understand how to correct safely. Your doctor or nurse could explain this to you.
As I said before, if your blood sugar is high, it can take 3 hours or more for your blood sugar to start to go down after an injection of Humalog. So, you need to wait longer to see if the Humalog has worked.