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Starting insulin can feel like a big adjustment, and it’s normal to have some worries at first. Insulin lowers your blood sugar, so timing your dose matters. Taking it too early or too late can cause your blood sugar to go too high or too low. With the right plan and a little practice, you’ll learn how to make insulin fit into your routine.
Your healthcare provider will help you create an insulin plan that fits your needs. In the meantime, here’s a general overview of what a type 2 diabetes care plan with insulin might look like.
After you eat or drink something with calories, your blood sugar rises because your digestive system breaks food down into glucose, or sugar.
Insulin helps the body use sugar in the blood. Blood sugar is either used immediately for energy or stored for later use as glycogen or body fat. However, people with type 2 diabetes either don’t make enough insulin or the insulin they do make doesn’t work well. Injecting insulin helps your body do the job insulin is supposed to do and can help keep your blood sugar in the target range.
Insulin comes in different forms. Some act fast. Others take longer to work, but the effects last longer. Understanding how your insulin works helps you take it at the right time.
Rapid-acting and ultra-rapid-acting insulins are the fastest types. Rapid-acting insulin begins to work within 15 minutes of injection. The peak happens within one to two hours, and it lasts up to four hours. Ultra-rapid-acting insulin starts working in five to 15 minutes, peaks at 45 to 75 minutes, and lasts about three to five hours.
Regular or short-acting insulin takes half an hour to start working. Its effects peak at the two- to three-hour mark and might last for six hours at the most.
Intermediate-acting insulin works more slowly. It enters the bloodstream within two to four hours after injection and peaks between four and 12 hours later. Intermediate-acting insulin can last 12 to 18 hours.
There’s also long-acting insulin, which takes several hours to reach the bloodstream and take effect. However, its glucose-lowering effects can last for 24 hours or more. The onset and duration vary among specific insulins, even those within the same category. Degludec is a type of ultra-long-acting insulin. It starts working about one to two hours after injection and can last more than 40 hours. It works steadily, without a big peak.
Ultra-long-acting insulin doesn’t peak. Instead, this type works steadily for 36 hours or more. However, it can take up to six hours for ultra-long-acting insulin to reach the bloodstream after you inject it. Glargine U-300, a type of ultra-long-acting insulin, starts working about six hours after injection, can last 24 hours, and has no peak.
Some people with type 2 diabetes also use inhaled insulin along with long-acting insulin. Inhaled insulin works faster. It starts working within 15 minutes, peaks at 30 to 50 minutes, and can last for two to three hours.
Drug manufacturers also make premixed insulin. It’s a combination of rapid and longer-acting insulin, so it offers the best of both worlds for some people. The onset and duration can vary based on the formula. In general, premixed insulin takes effect in five to 60 minutes and can last 10 to 16 hours. The timing of intake also varies depending on the formulation, usually somewhere between 10 and 30 minutes before a meal.
Human premixed insulin is made from older forms of insulin that work a bit more slowly. It’s usually taken 30 minutes before a meal. Analog premixed insulin is made from newer insulin types that act faster, so it can be taken closer to mealtime. Your healthcare provider may suggest premixed insulin to help simplify your insulin routine. They can also explain which type you’re using and the best time to take it.
Bolus insulins (rapid, ultra-rapid, and short-acting) are taken around mealtime. Rapid- and ultra-rapid-acting insulin should be taken right before a meal. Because ultra-rapid-acting insulin works more quickly, you may be able to take it after starting your meal. Short-acting insulin should be taken 30 to 60 minutes before eating. These faster forms of mealtime insulin begin working quickly, and they help keep blood sugar levels from spiking after you eat.
You may need to adjust how many units of insulin you inject based on your starting blood sugar and the amount of carbohydrates in your meal. A registered dietitian, who is a diabetes educator, can help you sort out the specific details of your plan.
Blood sugar doesn’t rise only after you eat. When you haven’t eaten for a while, your liver releases stored sugar into your blood to keep your body fueled. That’s one reason people with type 2 diabetes often wake up with high blood sugar levels.
Long-acting insulin helps keep blood sugar steadier all day and night, even between meals and while you sleep. You may also hear long-acting insulin called background or basal insulin.
One member of DiabetesTeam described how they take both forms of insulin: “I take short-acting insulin three times a day and one long-acting before going to bed. I test before meals and in the middle of the night to make sure that my sugar levels don’t drop too low.”
Getting the timing of your insulin right is important, but it’s not always easy. It’s simpler when your days follow a regular pattern — but for most people, life isn’t that predictable. Changes in meals, activity, stress, or illness can all affect your blood sugar and how much insulin you need.
Other variables affect blood sugar levels and insulin needs. For example, if you get sick, skip a meal, go out for a big dinner, or do an unusual amount of physical activity, your insulin needs may be different that day. Fortunately, you can check your blood glucose levels and adjust your insulin dose when things don’t go as expected. You should also develop an emergency plan with your healthcare team that outlines what to do if your blood sugar spikes or drops.
Glucose meters, such as Accu-Chek, and continuous glucose monitors, such as FreeStyle, offer ways you can track your blood sugar levels. If you are new to monitoring your blood sugar levels and you get a high reading when you feel like you shouldn’t, sometimes it’s best to double-check before injecting insulin right away.
A continuous glucose monitor shows real-time changes in your blood sugar levels. It helps you know when it’s time to take insulin or make other adjustments. In addition, an insulin pump can simplify your insulin injections. This small wearable device can balance blood sugar and insulin delivery throughout the day and night. An insulin pump can coordinate insulin doses with continuous glucose monitor readings through an automated insulin delivery system. The U.S. Food and Drug Administration (FDA) has cleared several automated insulin delivery systems for many adults with type 2 diabetes who use insulin. Using new diabetes technology can help you better control your blood sugar, lower your risk of complications, and make daily life easier.
Members of DiabetesTeam have shared their success with insulin pumps. “This pump helped me big time with my sugars,” said one member. “My starting A1c was 7.1, and now it’s 6. I’ve also lost 30 pounds. My in-range numbers are usually 80 to 100 percent.”
Another wrote, “I have been through all the various forms of medication and am now using an insulin pump, which helps to reduce the number of times I have to poke my body. I used to be doing five or six shots a day, but now I just change the insertion set once every three days. In the meantime, just set the pump to deliver the insulin for my meals and background insulin. It works well for me.”
Starting insulin comes with a learning curve, and it’s OK to have questions. If you’re unsure about your plan, talk with your healthcare provider. They may recommend diabetes classes where you can learn more about insulin and ways to manage your condition. There are many helpful resources available — don’t hesitate to use them. Getting support can make it easier to take control of your health.
On DiabetesTeam, people share their experiences with diabetes, get advice, and find support from others who understand.
Do you inject insulin to improve your blood sugar or glycemic control with type 2 diabetes? Let others know in the comments below.
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Regarding timing between fast acting and long acting , it totally depends & there is no 'rule'. You could inject both at the same time, & your Endo should explain what factors determine timing.
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