Treatments for Type 2 Diabetes: An Overview
Understanding Type 2 Diabetes
Type 2 diabetes arises when the body either fails to produce sufficient insulin or does not effectively respond to insulin. Insulin, a hormone produced by the pancreatic beta cells, is crucial for regulating blood sugar levels. In individuals with type 2 diabetes, these beta cells malfunction, leading to elevated blood sugar levels, known as hyperglycemia. This condition poses significant health risks, including increased chances of heart disease, stroke, kidney disease, and complications affecting vision and nerves.
Diagnosing Type 2 Diabetes
To diagnose type 2 diabetes, healthcare professionals assess an individual’s blood sugar levels using specific tests. The two primary screening methods are the fasting plasma glucose test (FPG) and the glycated hemoglobin test (A1C).
Fasting Plasma Glucose (FPG) Test
The FPG test measures blood sugar levels after fasting for at least eight hours. The results are interpreted as follows:
– No diabetes: FPG level less than 5.6 mmol/L (100 mg/dL)
– Prediabetes: FPG level between 5.6 to 6.9 mmol/L (100-125 mg/dL)
– Diabetes: FPG level of 7.0 mmol/L or higher (126 mg/dL or higher)
Glycated Hemoglobin (A1C) Test
The A1C test assesses the percentage of blood sugar attached to hemoglobin. Results indicate:
– No diabetes: A1C level below 5.7%
– Prediabetes: A1C level between 5.7-6.4%
– Diabetes: A1C level of 6.5% or higher
Additional tests, such as a random blood sugar test and an oral glucose tolerance test, may also be utilized to confirm the diagnosis.
Top Seven Type 2 Diabetes Medications
Upon diagnosis, if an individual’s A1C level is below 8.5%, lifestyle modifications in diet and exercise may suffice initially. However, if blood sugar levels do not decrease within two to three months, medication is warranted. Those with an A1C level of 8.5% or higher typically begin medication immediately, often requiring two drugs from different classes.
Goals of Treatment
The primary goal of treating type 2 diabetes is to maintain blood sugar levels within normal or near-normal ranges. While diabetes is not curable, some individuals may manage their condition with minimal intervention, whereas others may need extensive medication.
1. Metformin
Metformin is often the first-line treatment for newly diagnosed type 2 diabetes patients without complex symptoms. It belongs to the biguanide class and is recognized for its safety and effectiveness.
Mechanism of Action
Metformin lowers blood sugar levels by reducing glucose production in the liver, decreasing intestinal glucose absorption, and enhancing insulin sensitivity.
Advantages
– Decreases liver glucose production
– May reduce glucose absorption in the intestines
– Typically does not cause weight gain
– Lowers A1C levels by about 1%
– Low risk of hypoglycemia when used alone
Disadvantages
Potential side effects may include nausea, diarrhea, abdominal discomfort, and a metallic taste. Caution is advised for individuals with kidney issues, heart failure, or alcoholism.
2. DPP-4 Inhibitors
DPP-4 inhibitors, such as alogliptin, linagliptin, sitagliptin, and saxagliptin, prevent the breakdown of the GLP-1 hormone, which helps lower blood sugar levels post-meal.
Advantages
– Increases availability of GLP-1 hormone
– Enhances other blood sugar-regulating molecules
Disadvantages
Possible side effects include cold-like symptoms and hypersensitivity reactions.
3. SGLT-2 Inhibitors
This newest class of diabetes medications includes canagliflozin, dapagliflozin, and empagliflozin. SGLT-2 inhibitors prevent glucose reabsorption in the kidneys, leading to its excretion through urine.
Advantages
– May lower blood pressure
– Low risk of hypoglycemia
Disadvantages
Side effects can include genital infections, urinary tract infections, and increased ketone levels.
4. GLP-1 Receptor Agonists
GLP-1 receptor agonists, including liraglutide, dulaglutide, exenatide, and semaglutide, mimic the GLP-1 hormone, promoting insulin secretion while suppressing glucagon release.
Advantages
– Lowers blood sugar levels and A1C levels more quickly than DPP-4 inhibitors
– Promotes satiety
Disadvantages
Potential side effects include gastrointestinal issues and risks of pancreatitis.
5. Sulfonylureas
Sulfonylureas, such as glyburide and glimepiride, stimulate insulin release. They can be used alone or alongside other medications.
Advantages
– Effectively stimulate insulin release
Disadvantages
These medications may lead to weight gain and a higher risk of hypoglycemia.
6. Alpha-glucosidase Inhibitors
Acarbose and miglitol are in this class and work by delaying carbohydrate digestion in the intestine.
Advantages
– Does not cause weight gain
– Lowers A1C levels effectively
Disadvantages
May cause gastrointestinal discomfort.
7. Thiazolidinediones (TZDs)
Drugs like pioglitazone and rosiglitazone improve insulin sensitivity but raise concerns regarding cardiovascular safety and potential bladder cancer risk.
Advantages
– Improves glucose uptake and insulin sensitivity
Disadvantages
Associated with weight gain, fluid retention, and other risks.
Conclusion
Type 2 diabetes is a progressive condition, necessitating ongoing medication management as its severity can increase over time. Insulin therapy may become necessary for some patients, providing significant advantages in controlling blood sugar levels.
Further Reading
– What is the Best Diet for Weight Loss for Those at Risk of Diabetes?
– Are Zinc Supplements for Diabetes Beneficial?
– The Link Between Apple Polyphenol Phloridzin and Type 2 Diabetes Risk
References
1. RxTx [Internet]. E-therapeutics.ca. 2018.
2. Type 2 Diabetes Mellitus Treatment & Management: Approach Considerations [Internet]. Medscape. 2018.
3. Rena G, Hardie D, Pearson E. The Mechanisms of Action of Metformin. Diabetologia. 2017.
4. Health Canada Alerts [Internet]. Healthycanadians.gc.ca. 2018.
5. Diabetes Canada: Clinical Practice Guidelines [Internet]. 2018.
6. Metformin – DrugBank [Internet]. Drugbank.ca. 2018.
Disclaimer: This article is for informational purposes only and should not be considered medical advice.