This is a very important question, so I'm glad you asked.
Before the new "insulin pens" came out, there were four types of insulin
: rapid-acting, short-acting, intermediate-acting, and long-acting.
When it comes to the pre-mixed insulins, like Novolog 70/30, there are fewer differences between the brands (for example, Novolog versus Novolin).
Whether contained in a bottle or in a pen, the premixed insulins all contain a combination of both an intermediate-acting insulin and a short-acting insulin. The numbers on the bottle or pen refer to the percentage of each type of insulin contained in the mixture. That means both Novolin 70/30 and Novolog 70/30 contain a mixture that is 70% intermediate-acting insulin with 30% short-acting insulin.
However, Novolin 70/30 takes slightly longer to begin working than Novolog 70/30, which has a rapid onset. Both Novolin 70/30 and Novolog 70/30 may last up to 24 hours in the system.
No matter what kind of insulin you've been prescribed, it's crucial you understand how to use it correctly. Using any insulin incorrectly can cause serious side effects. If you don't understand how to use your insulin, please consult a pharmacist as soon as possible.
Hope this helps!
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