Insulin Therapy for Type 2 Diabetes: What to Know

A clinician may recommend insulin when other medicines and daily habits do not keep glucose in the agreed range, or when glucose is very high during illness or another period of physical stress. The plan is tailored to your meals, activity, other medicines, kidney function, and ability to monitor glucose.

Insulin is commonly given with a pen, syringe, or pump. Some plans use a background dose that works between meals and overnight; others add mealtime doses to cover food. Your prescription should specify the insulin name, dose, timing, and what to do if you eat less than planned or miss a dose. Do not change the dose on your own.

Glucose checks show how your body responds. A continuous glucose monitor can display changing readings and trends, while finger-stick testing may still be part of some plans. Record unusual readings, skipped meals, exercise, and symptoms so your care team can adjust treatment safely.

Learn the injection technique, storage instructions, needle disposal method, and sick-day plan before starting. Rotate injection areas as shown by your clinician and check the insulin label each time. Keep a quick source of glucose available if your care team advises it, and tell household members how to respond if you become confused or unable to treat yourself.

Low blood glucose can cause sweating, shaking, hunger, dizziness, irritability, blurred vision, or confusion. Follow the treatment steps supplied by your diabetes team, recheck as instructed, and seek help if symptoms do not improve. Alcohol, delayed meals, extra activity, and taking more insulin than prescribed can increase this risk.

Contact your diabetes team promptly if readings repeatedly fall outside your agreed range, injections are difficult, the injection site becomes painful or swollen, or you are vomiting and cannot keep fluids down. Illness can change insulin needs even when you are eating less, so use the sick-day instructions given to you.

Seek emergency help for severe confusion, a seizure, loss of consciousness, severe breathing difficulty, or marked dehydration. Do not give food or drink to someone who is unconscious. If you have a prescribed emergency treatment for severe low glucose, use it according to your clinician's instructions while emergency help is arranged.

Ask which insulin you are using, when it starts working, when to take it around meals, and what to do after a missed or delayed dose. Ask how often to check glucose, what readings require a call, how exercise and fasting affect your plan, and how to store and transport your supplies. Bring your glucose record and a complete list of medicines to review visits.