Drugs Used for Diabetes

Understanding the Mechanisms and Side Effects

Slide1: Introduction to Diabetes Mellitus

  • Diabetes mellitus is a chronic disorder characterized by high blood glucose levels.
  • There are two commonly encountered types: type 1 and type 2.
  • Type 1 is characterized by insulin-producing cell destruction, leading to inadequate insulin production.
  • Type 2 is characterized by insulin resistance and gradual insulin deficiency.

Slide2: The Role of Insulin

  • Insulin is a peptide hormone that stimulates glucose uptake by cells.
  • It allows glucose to be used immediately for energy or stored as glycogen.
  • Insulin production is triggered by rising blood glucose levels.
  • Insulin deficiency or resistance leads to high blood glucose levels.

Slide3: Insulin and Its Analogs

  • Insulin preparations can be divided into three major categories based on onset and duration of action: rapid-acting, short-acting, and long-acting.
  • Insulin analogs with altered amino acid sequences have been developed for different action profiles.
  • Rapid-acting insulins, such as insulin Lispro, act quickly with a shorter duration.
  • Long-acting insulins, like insulin Degludec, have a slow onset and last beyond 24 hours.

Slide4: Side Effects of Insulin

  • The most common side effect of insulin is hypoglycemia (low blood glucose).
  • Lipodystrophy, the development of abnormal fat deposits at injection sites, can also occur.
  • Patients should be aware of these side effects and monitor their blood glucose levels.

Slide5: Synthetic Amylin

  • Amylin is a peptide hormone that delays gastric emptying and suppresses glucagon secretion.
  • Synthetic amylin, like Pramlintide, can reduce insulin doses for diabetes treatment.
  • However, it may still cause hypoglycemia and has side effects like nausea and weight loss.

Slide6: Incretin Mimetics

  • Incretins are metabolic hormones that stimulate insulin production.
  • GLP-1 mimetics, like Exenatide and Liraglutide, are resistant to inactivation by DPP-4 enzyme.
  • GLP-1 mimetics also slow gastric emptying and promote weight loss.
  • However, they may have side effects like gastrointestinal problems and an increased risk of pancreatitis.

Slide7: Overview of Oral Antidiabetic Agents

  • Oral antidiabetic agents can be categorized into different classes with distinct mechanisms of action.
  • These agents provide alternative treatment options for diabetes management.
  • Classes include DPP-4 inhibitors, sulfonylureas, glinides, biguanides, thiazolidinediones, SGLT-2 inhibitors, and alpha-glucosidase inhibitors.

Slide8: DPP-4 Inhibitors

  • DPP-4 inhibitors enhance the effects of incretin hormones by inhibiting the DPP-4 enzyme.
  • This leads to increased insulin secretion, decreased gastric emptying, and reduced glucagon release.
  • Common DPP-4 inhibitors include Alogliptin, Linagliptin, Saxagliptin, and Sitagliptin.
  • Side effects are similar to GLP-1 mimetics, such as nasopharyngitis and headache.

Slide9: Sulfonylureas

  • Sulfonylureas stimulate insulin secretion by binding to ATP-sensitive potassium channels.
  • This triggers membrane depolarization, calcium influx, and insulin release.
  • Examples of sulfonylureas include Glimepiride, Glyburide, and Glipizide.
  • Side effects may include hypoglycemia and weight gain.

Slide10: Glinides

  • Glinides also stimulate insulin secretion, but through a different site and kinetics than sulfonylureas.
  • They have a more rapid onset and shorter duration of action.
  • Examples of glinides include Nateglinide and Repaglinide.
  • Common side effects are hypoglycemia and weight gain, although the risk may be lower than with sulfonylureas.

Slide11: Biguanides

  • Biguanides, like Metformin, primarily reduce hepatic glucose production.
  • They also slow intestinal absorption of glucose and increase insulin sensitivity.
  • Metformin is the only biguanide currently available.
  • Common side effects of Metformin include gastrointestinal symptoms and the risk of lactic acidosis in certain patients.

Slide12: Thiazolidinediones

  • Thiazolidinediones selectively activate PPAR-gamma, a nuclear receptor involved in glucose and lipid metabolism.
  • Activation of PPAR-gamma enhances insulin sensitivity and inhibits hepatic glucose production.
  • Examples of thiazolidinediones are Pioglitazone and Rosiglitazone.
  • Side effects include weight gain, fluid retention, and potential hepatotoxicity.

Slide13: SGLT-2 Inhibitors

  • SGLT-2 inhibitors inhibit glucose reabsorption in the kidneys, leading to increased urinary glucose excretion.
  • This reduces blood glucose levels, contributes to osmotic diuresis, and may lead to weight loss.
  • Examples of SGLT-2 inhibitors are Canagliflozin and Dapagliflozin.
  • Side effects include increased thirst, higher risk of urinary tract and genital infections.

Slide14: Alpha-Glucosidase Inhibitors

  • Alpha-glucosidase inhibitors block the enzyme responsible for carbohydrate breakdown in the intestines.
  • This delays glucose absorption and reduces postprandial glucose levels.
  • Acarbose and Miglitol are examples of alpha-glucosidase inhibitors.
  • Common side effects include gastrointestinal symptoms.

Slide15: Conclusion

  • Understanding the different classes of drugs used for diabetes is crucial for effective management.
  • Each class has its unique mechanisms of action and potential side effects.
  • Individualized treatment plans should be based on patient characteristics and needs.
  • Regular monitoring and consultation with healthcare providers are important for optimal diabetes care.

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