There are a number of types of insulins available. Each has different time of onset of action & duration of action. They can be broadly claasified as --rapid acting like aspart & lispro (onset of action 10 min, duration of action-3 to 4 hrs), short acting like regular insulin (onset =30min, duration=5-8hrs), intermediate acting like lente or NPH (onset=1-3 hrs, duaration=16-24hrs), long acting like ultralente (onset= 4-6hrs, duration=24-28hrs).
The body's requirement of insulin is different at different times. For example, more insulin action is required after meals to decrease the increased glucose levels after meal. The amount of insulin required also varies with what food we eat & how much.
So, providing insulin to body is not like providing any medication to body. The total insulin given during a 24 hour period is not important. What is important is that adequate insulin action be ensured at the right time. This will keep the blood sugar within normal range all the time. This is called round-the-clock-euglycemia & is very important in preventing long term complications of diabetes.
To achieve round-the-clock-euglycemia, doctors use different types of insulins given at different times of the day.
I hope I have made it clear to you. If you need more information or clarification, please ask for it.
For more information, please read about dosage & strategies in this article
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