Insulins are categorized first by length of action, then by origin and by suspension. The four durations are: 
|Rapid-acting or Fast-acting insulin begins to work shortly after injection, peaks in about 1 hour, and continues to work for 2 to 4 hours.|
|Regular or Short-acting insulin reaches the bloodstream 30 minutes to an hour after injection, peaks anywhere from 2 to 3 hours after injection, and is effective for approximately 6-8 hours.|
|Intermediate-acting insulin generally reaches the bloodstream about 1-2 hours after injection, and is effective for about 8 to 12 hours.|
|Long-acting insulin generally reaches the bloodstream about 2 to 4 hours after injection, peaks 4 to 8 hours later and is effective for about 12 to 18 hours.|
The article Insulin has more details.
The following insulins have articles of their own:
This category has the following 53 subcategories, out of 53 total.
Pages in category "Insulins"
The following 24 pages are in this category, out of 224 total.