Managing diabetes mellitus involves far more than just monitoring blood sugar levels. From established medications that have helped millions to cutting-edge therapies being tested in research studies, people living with diabetes today have access to an expanding range of treatment options designed to help them control their condition, prevent complications, and maintain quality of life.

Finding the Right Path in Diabetes Care

When someone receives a diabetes diagnosis, the primary goal of treatment is not to simply lower blood sugar numbers on a test result. The real aim is to help that person live a full, healthy life while reducing the risk of serious complications that can affect the heart, kidneys, eyes, nerves, and other parts of the body. Treatment plans are carefully tailored to each individual because diabetes affects people differently depending on which type they have, how long they’ve had it, their age, other health conditions, and their daily routines.^[1]

Medical societies around the world have established clinical guidelines—which are recommendations based on scientific research—to help doctors choose the best treatments for their patients. These guidelines are regularly updated as new evidence emerges from ongoing research. At the same time, scientists and pharmaceutical companies are actively testing innovative therapies in clinical trials, which are carefully designed research studies that evaluate whether new treatments are safe and effective before they become widely available.^[2]

The treatment approach varies significantly between type 1 and type 2 diabetes. People with type 1 diabetes, which occurs when the body stops producing insulin entirely, must take insulin every day to survive. Type 2 diabetes, the most common form, develops when the body doesn’t use insulin properly or doesn’t make enough of it. Many people with type 2 can manage their condition through lifestyle changes and oral medications, though some eventually need insulin as well.^[8]

Established Treatments: The Foundation of Diabetes Management

For decades, healthcare providers have relied on a combination of lifestyle modifications and medications to help people with diabetes keep their blood glucose levels within a healthy range. These standard treatments have been proven effective through years of research and real-world use, and they remain the backbone of diabetes care today.

Lifestyle Changes as Medicine

Before discussing medications, it’s important to understand that healthy eating, regular physical activity, adequate sleep, and stress management are not optional add-ons to diabetes treatment—they are essential components of care. What a person eats directly affects their blood sugar levels. Foods high in refined carbohydrates and added sugars can cause rapid spikes, while whole grains, vegetables, fruits, lean proteins, and healthy fats tend to have a gentler impact.^[17]

Physical activity helps in multiple ways. When muscles contract during exercise, they use glucose for energy, which helps lower blood sugar levels. Regular activity also improves how the body responds to insulin, a problem known as insulin resistance that underlies type 2 diabetes. People with diabetes are often encouraged to aim for at least 150 minutes of moderate activity spread throughout the week, though any increase in movement can be beneficial.^[19]

Weight management is particularly important for people with type 2 diabetes who are overweight. Even modest weight loss—just 5 to 10 pounds—can significantly improve blood sugar control and may reduce the need for medications. Some people with type 2 diabetes who achieve substantial weight loss through diet and exercise may even experience remission, meaning their blood sugar levels return to normal ranges without medication, though this requires ongoing commitment to healthy habits.^[27]

Insulin Therapy

Insulin is the most critical medication for people with type 1 diabetes and is also needed by some people with type 2 diabetes when other treatments don’t provide adequate control. Insulin is a hormone that acts like a key, unlocking cells so glucose can enter and be used for energy. Without it, glucose accumulates in the bloodstream to dangerous levels.^[11]

There are several types of insulin, categorized by how quickly they work and how long their effects last. Rapid-acting insulin begins working within 15 minutes and is typically taken right before meals to handle the rise in blood sugar that comes from eating. Short-acting insulin takes effect within 30 minutes and lasts a few hours. Intermediate-acting insulin provides coverage for about half a day, while long-acting insulin works steadily for 24 hours or longer, providing a baseline level of insulin throughout the day and night.^[12]

Insulin can be delivered in several ways. Most commonly, people use insulin pens, which are convenient, pre-filled devices with a dial to set the dose. Traditional syringes and vials are still used by some people. Insulin pumps are small computerized devices worn on the body that deliver insulin continuously through a tiny tube inserted under the skin. The most advanced option is an automated insulin delivery system, sometimes called an artificial pancreas, which combines an insulin pump with a continuous glucose monitor and uses an algorithm to automatically adjust insulin delivery based on real-time glucose readings.^[10]

The dosing of insulin must be carefully matched to food intake, physical activity, stress levels, and other factors that affect blood sugar. Taking too much insulin can cause hypoglycemia, or low blood sugar, which can lead to shakiness, confusion, rapid heartbeat, and in severe cases, loss of consciousness. This is why people taking insulin need to check their blood sugar regularly and learn to recognize warning signs of low blood sugar.^[12]

Oral Medications for Type 2 Diabetes

For people with type 2 diabetes, several classes of pills can help control blood sugar. The most commonly prescribed oral medication is metformin, which belongs to a drug class called biguanides. Metformin works primarily by reducing the amount of glucose the liver releases into the bloodstream. It also helps muscle cells become more sensitive to insulin. Metformin is usually the first medication prescribed when lifestyle changes alone aren’t enough to control type 2 diabetes.^[14]

Another important class is sulfonylureas, medications that stimulate the pancreas to release more insulin. These drugs work well but carry a risk of causing low blood sugar, especially if meals are skipped. Meglitinides work similarly to sulfonylureas but act more quickly and for a shorter time, typically taken right before meals.^[16]

DPP-4 inhibitors (dipeptidyl peptidase-4 inhibitors) work by blocking an enzyme that breaks down helpful hormones in the gut called incretins. When these hormones remain active longer, they help the pancreas release the right amount of insulin in response to meals. Alpha-glucosidase inhibitors slow down the breakdown of starches in the intestine, which means glucose enters the bloodstream more gradually after eating.^[13]

Thiazolidinediones improve insulin sensitivity, helping muscle and fat cells use glucose more effectively. However, these medications can cause weight gain and fluid retention, and are used less frequently today due to concerns about side effects including increased risk of heart problems with some members of this drug class.^[16]

Injectable Medications Beyond Insulin

Two newer classes of injectable medications have become important options for type 2 diabetes treatment. GLP-1 receptor agonists (glucagon-like peptide-1 receptor agonists) are medications that mimic a natural gut hormone. They stimulate insulin release when blood sugar is elevated, reduce the liver’s glucose production, slow stomach emptying so food is absorbed more gradually, and decrease appetite. Many people using these medications experience weight loss, which provides additional benefits for type 2 diabetes management. These injections are typically given once daily or once weekly depending on the specific medication.^[14]

Amylin analogs are synthetic versions of another hormone normally made by the pancreas alongside insulin. These medications slow gastric emptying and suppress the release of glucagon, a hormone that raises blood sugar. They are always used in combination with insulin.^[16]

SGLT2 Inhibitors

SGLT2 inhibitors (sodium-glucose co-transporter 2 inhibitors) represent a unique approach to diabetes treatment. These oral medications work in the kidneys, blocking the reabsorption of glucose that has been filtered from the blood. This causes excess glucose to be eliminated in the urine. Beyond lowering blood sugar, these medications have shown benefits for heart and kidney health, which is particularly important since diabetes increases the risk of cardiovascular disease and kidney damage.^[13]

Duration and Monitoring of Standard Treatment

Type 2 diabetes treatment is typically lifelong, though the specific medications and dosages often change over time. As the disease progresses, the pancreas may gradually lose its ability to produce insulin, requiring treatment adjustments. Healthcare providers monitor treatment effectiveness primarily through the HbA1C test, which measures average blood sugar levels over the previous three months. Most treatment guidelines recommend an HbA1C target below 7 percent for many adults with diabetes, though individualized targets may be higher or lower depending on age, other health conditions, and risk of low blood sugar.^[15]

Regular monitoring also includes checking for complications. This typically involves annual eye examinations to detect diabetic retinopathy (damage to blood vessels in the retina), urine tests to screen for kidney problems, foot examinations to identify nerve damage or circulation issues, and cardiovascular risk assessment including blood pressure and cholesterol measurements.^[17]

Common Side Effects of Standard Treatments

All diabetes medications can cause side effects, though most people tolerate them well. Metformin commonly causes digestive upset including nausea, diarrhea, and stomach discomfort, especially when first starting the medication. These symptoms often improve over time. Sulfonylureas and meglitinides carry a risk of hypoglycemia and weight gain. GLP-1 receptor agonists frequently cause nausea, vomiting, and diarrhea, particularly during the first few weeks of treatment. SGLT2 inhibitors increase the risk of genital yeast infections and urinary tract infections because of the glucose in urine, and rarely can cause a serious condition called diabetic ketoacidosis.^[13]

Insulin side effects primarily involve hypoglycemia and weight gain. Injection site reactions, such as redness or swelling, can occur but are usually mild. People using insulin need education about recognizing and treating low blood sugar episodes, which may require consuming fast-acting carbohydrates like juice or glucose tablets.^[12]

Innovative Therapies Being Tested in Clinical Trials

While standard treatments work well for many people with diabetes, researchers continue searching for new approaches that might work better, have fewer side effects, or address the underlying causes of the disease more effectively. Clinical trials are research studies where new treatments are carefully tested before being approved for general use. These studies follow strict safety protocols and are conducted in phases.

Understanding Clinical Trial Phases

Phase I trials primarily test whether a new treatment is safe. These small studies, usually involving 20 to 80 healthy volunteers or patients, help researchers understand how the body processes the medication, what dose is appropriate, and what side effects might occur. Phase II trials involve larger groups of people who have the condition being studied (typically several hundred participants) and focus on whether the treatment actually works and continues to be safe. Phase III trials are large-scale studies, sometimes involving thousands of participants at multiple locations, that compare the new treatment to the current standard treatment or placebo to definitively determine if it’s effective and better than existing options.^[4]

Novel Insulin Formulations and Delivery Methods

Researchers are developing new forms of insulin that work in more targeted ways. Some experimental insulins are being designed to respond directly to blood glucose levels, releasing their activity only when blood sugar is elevated—essentially creating a “smart” insulin that could reduce the risk of hypoglycemia. These glucose-responsive insulins are currently in early-phase clinical trials, with researchers testing whether they can safely and effectively adjust their activity based on changing blood sugar levels throughout the day.^[10]

Other trials are exploring oral insulin delivery. Because insulin is a protein that gets broken down by digestive enzymes, it has traditionally needed to be injected. Scientists are testing special coatings and delivery systems that might protect insulin as it passes through the stomach, allowing it to be absorbed in the intestines instead. While this research is still in relatively early stages, successful oral insulin would be a major breakthrough for people who struggle with daily injections.

Cell-Based Therapies

One of the most promising areas of diabetes research involves replacing or regenerating the insulin-producing beta cells that are destroyed in type 1 diabetes. Pancreatic islet transplantation is a procedure where insulin-producing cells are taken from a deceased donor’s pancreas and infused into a person with type 1 diabetes, typically through a vein leading to the liver. When successful, these transplanted cells can begin producing insulin, potentially eliminating the need for insulin injections. However, recipients must take lifelong immunosuppressive medications to prevent their immune system from rejecting the transplanted cells.^[10]

This approach has shown promising results in clinical trials, with some participants achieving insulin independence for several years after transplantation. However, there are significant limitations: donor islets are scarce, the immunosuppressive drugs have serious side effects, and the transplanted cells may eventually stop working. Currently, islet transplantation is generally reserved for people with type 1 diabetes who have severe hypoglycemia unawareness—a dangerous condition where they don’t recognize when their blood sugar is dropping too low.^[12]

To overcome the donor shortage problem, researchers are exploring ways to grow beta cells in the laboratory from stem cells. Stem cell therapy trials are testing whether these lab-grown cells can be safely transplanted and will function properly to produce insulin. Some research teams are also working on encapsulation devices—tiny containers that hold the insulin-producing cells while protecting them from immune attack, potentially eliminating the need for immunosuppressive drugs. These encapsulation systems would have tiny pores that allow glucose to enter and insulin to exit, but keep immune cells out. Multiple clinical trials are underway at research centers in the United States, Europe, and other regions testing various versions of these approaches.

Gene Therapy Approaches

Gene therapy represents an entirely different strategy for addressing diabetes. Instead of replacing damaged cells or giving medications, gene therapy aims to modify the genetic instructions in a person’s own cells. For type 1 diabetes, some experimental gene therapies are attempting to change how the immune system behaves, potentially stopping it from attacking beta cells. Other gene therapy approaches are trying to convert other types of cells in the pancreas or even cells in the liver into insulin-producing cells by introducing genes that tell them to start making insulin.

These gene therapy trials are generally in Phase I or early Phase II, testing safety and initial effectiveness in small numbers of carefully selected participants. The technology is complex and must overcome significant challenges, including delivering the therapeutic genes efficiently to the right cells, ensuring the modified cells produce the right amount of insulin at the right times, and preventing any unintended effects from the genetic changes. While gene therapy remains largely experimental for diabetes, the early trial results being reported by research teams have generated cautious optimism in the scientific community.

Immunotherapy for Type 1 Diabetes

Since type 1 diabetes is an autoimmune disease—meaning the body’s immune system mistakenly attacks its own cells—researchers are testing treatments designed to stop or slow this autoimmune destruction. Various immunotherapy approaches are being studied in clinical trials. Some therapies aim to suppress the overall immune response, while others try to specifically target only the immune cells attacking beta cells while leaving the rest of the immune system functioning normally.

One immunotherapy that has shown promise is teplizumab, a medication that modifies T-cells, which are a type of immune cell involved in the attack on beta cells. Clinical trials have demonstrated that teplizumab can delay the onset of clinical type 1 diabetes in people who are at high risk because they already show early immune system changes. The drug received regulatory approval in some countries for this specific purpose, representing an important milestone—the first therapy approved to delay type 1 diabetes rather than just treating it after diagnosis. Researchers are now conducting additional trials to understand which high-risk individuals benefit most from this approach and whether similar immunotherapies might work even better.

Novel Medications Targeting Multiple Pathways

Pharmaceutical companies are developing medications that work on multiple aspects of diabetes simultaneously. For example, some experimental drugs called dual GLP-1/GIP receptor agonists activate two different gut hormone pathways at once. Early clinical trial results suggest these medications may be even more effective than single GLP-1 agonists at lowering blood sugar and promoting weight loss, with Phase III trials showing significant improvements in both glucose control and body weight in participants with type 2 diabetes. One such medication, tirzepatide, has completed its clinical trial program and has been approved in several countries.

Other research is exploring triple agonists that activate three hormone pathways simultaneously. These are in earlier-stage clinical trials, but preliminary results have shown promising effects on blood sugar, weight, and metabolic health markers. Researchers are also testing whether these multi-action medications might have benefits beyond diabetes control, potentially helping with fatty liver disease or cardiovascular health.

Medications Targeting Inflammation

Scientists have discovered that chronic inflammation plays an important role in both type 1 and type 2 diabetes. This has led to clinical trials testing whether anti-inflammatory medications might help. Some trials are examining whether drugs that block specific inflammatory molecules—such as interleukin-1 or tumor necrosis factor—can preserve remaining beta cell function in newly diagnosed type 1 diabetes or improve insulin sensitivity in type 2 diabetes. These Phase II trials are evaluating not just whether these medications lower blood sugar, but whether they can actually slow disease progression.

Technologies for Better Glucose Monitoring and Control

While not medications, advanced technologies being tested in clinical trials are changing how diabetes is managed. Beyond the automated insulin delivery systems already mentioned, researchers are developing even more sophisticated closed-loop systems that can predict blood sugar changes before they happen and adjust insulin delivery proactively. Some trials are testing systems that integrate additional hormones, such as glucagon or amylin, along with insulin to more closely mimic how a healthy pancreas functions.

Continuous glucose monitors (CGMs) have already become important tools, but newer versions in clinical testing are smaller, last longer, and provide more accurate readings. Some experimental CGMs don’t require any device worn on the skin at all—researchers are testing contact lenses and other non-invasive approaches that might measure glucose continuously without any needles or skin sensors, though these technologies remain in early development phases.

Eligibility and Locations for Clinical Trials

Clinical trials for diabetes are conducted at medical centers and research institutions around the world, including in the United States, Europe, Asia, and other regions. Each trial has specific eligibility criteria—requirements that determine who can participate. These might include the type of diabetes, how long someone has had the condition, current HbA1C levels, age, other medications being taken, and other health conditions. Some trials specifically seek people newly diagnosed with diabetes, while others look for participants who have had the condition for years. Pregnant women, children, and older adults are sometimes excluded from certain trials or may have dedicated trials designed for their specific populations.

People interested in participating in diabetes clinical trials can search for opportunities through registries like ClinicalTrials.gov, which lists studies happening in the United States and many other countries. Diabetes research organizations, university medical centers, and some diabetes clinics also maintain information about local trial opportunities. Endocrinologists and diabetes care teams can often provide information about trials that might be appropriate for their patients.

Most Common Treatment Methods

• Lifestyle Modifications
  • Healthy eating with focus on whole grains, vegetables, fruits, lean proteins, and controlled portions to manage blood sugar levels^[17]
  • Regular physical activity, typically at least 150 minutes per week, to improve insulin sensitivity and glucose uptake by muscles^[19]
  • Weight loss of 5 to 10 pounds for overweight individuals can significantly improve blood sugar control^[27]
  • Stress management, adequate sleep, and smoking cessation as part of comprehensive care^[26]
• Insulin Therapy
  • Rapid-acting, short-acting, intermediate-acting, and long-acting insulin formulations delivered by syringe, pen, or pump^[12]
  • Automated insulin delivery systems that combine continuous glucose monitoring with insulin pumps and computer algorithms^[10]
  • Essential for all people with type 1 diabetes and some with type 2 diabetes^[8]
• Oral Medications
  • Metformin (biguanide) reduces liver glucose production and improves insulin sensitivity, typically first-line treatment for type 2 diabetes^[14]
  • Sulfonylureas and meglitinides stimulate pancreatic insulin release^[16]
  • DPP-4 inhibitors prolong incretin hormone activity to improve glucose-dependent insulin secretion^[13]
  • SGLT2 inhibitors cause glucose elimination through urine and provide cardiovascular and kidney benefits^[13]
  • Thiazolidinediones improve insulin sensitivity in muscle and fat tissue^[16]
  • Alpha-glucosidase inhibitors slow carbohydrate absorption from the intestine^[13]
• Injectable Medications (Non-Insulin)
  • GLP-1 receptor agonists mimic gut hormones to stimulate insulin release, suppress appetite, and often promote weight loss^[14]
  • Amylin analogs slow gastric emptying and suppress glucagon release, used with insulin^[16]
• Advanced Technology
  • Continuous glucose monitoring systems provide real-time blood sugar readings to guide treatment adjustments^[10]
  • Insulin pumps for precise continuous insulin delivery^[12]
• Cell-Based Therapies (Clinical Trials/Limited Availability)
  • Pancreatic islet transplantation to replace insulin-producing cells in type 1 diabetes^[10]
  • Stem cell-derived beta cells and encapsulation devices being tested in clinical trials
• Immunotherapy (Primarily Research/Limited Approval)
  • Medications like teplizumab that modify immune system activity to delay type 1 diabetes onset in high-risk individuals
  • Various immune-modulating approaches being tested in clinical trials
• Bariatric Surgery
  • Weight loss surgery may lead to diabetes remission in some people with type 2 diabetes and obesity^[27]