* Ease of use and carry them to anywhere outside the home while traveling or at work or at school.
* The patient does not need to withdraw insulin from the vial.
* How easy and convenient dose and the patient could give an accurate dose.
** Needles used in pens very thin and short and thus may be convenient for the patient compared to conventional insulin injections.
* Some research has shown that changing the patient than traditional insulin injections to insulin pens improved the regularity of patients taking sugar treatment also reduced the incidence of the sharp drop in blood sugar and other complications.
* Use of insulin pens in the long run less expensive material than traditional insulin injections.
