This is discussed in more detail in Chapter 20 . When Humalog and Regular insulins are combined in the same syringe, it does not matter which of the two insulins goes into the syringe first. Examples of mixtures of Humalog and Regular insulin are given in Chapter 20 . NPH insulin is made with a protein that allows it to be absorbed in the body more slowly. The letters NPH stand for N eutral P rotamine H agedorn.
Protamine is the protein added to the insulin to make it long-acting.
Hagedorn is the name of the man who developed it. Human NPH has its peak activity 6-8 hours after the injection in most people. If it is taken in the morning, the peak action comes before supper. Human NPH insulin lasts an average of 13 hours. The peak in NPH insulin activity and the duration of activity may vary for some people.