Exenatide – Mechanism, Dosage and Side Effects
Exenatide is a blood sugar-lowering medication used to treat type 2 diabetes. It mimics the gut hormone GLP-1 and stimulates insulin secretion in a glucose-dependent manner.
Wissenswertes über "Exenatide"
Exenatide is a blood sugar-lowering medication used to treat type 2 diabetes. It mimics the gut hormone GLP-1 and stimulates insulin secretion in a glucose-dependent manner.
What is Exenatide?
Exenatide is a synthetic drug belonging to the class of GLP-1 receptor agonists (glucagon-like peptide-1 receptor agonists). It is used in the management of type 2 diabetes mellitus and is not suitable for the treatment of type 1 diabetes. Exenatide was originally derived from the saliva of the Gila monster lizard (Heloderma suspectum) and shares approximately 53% sequence similarity with human GLP-1.
Mechanism of Action
Exenatide binds to the GLP-1 receptor in the pancreas and various other tissues, producing several blood glucose-lowering effects:
- Glucose-dependent insulin secretion: Exenatide stimulates insulin release from pancreatic beta cells only when blood glucose levels are elevated, which significantly reduces the risk of hypoglycemia.
- Suppression of glucagon secretion: Glucagon, a hormone that raises blood sugar, is inhibited by exenatide.
- Slowing of gastric emptying: By delaying gastric emptying, exenatide reduces the rate at which glucose is absorbed into the bloodstream after meals.
- Appetite suppression and weight reduction: Exenatide acts on the hypothalamus in the brain to promote satiety, often resulting in weight loss.
Indication
Exenatide is approved for the treatment of type 2 diabetes mellitus in adults when adequate blood glucose control cannot be achieved through diet, exercise, and other oral antidiabetic medications such as metformin, sulfonylureas, or thiazolidinediones. It may be used as an add-on therapy to these medications.
Dosage Forms and Administration
Exenatide is available in two formulations:
- Short-acting exenatide (e.g., Byetta): Administered as a subcutaneous injection twice daily, within 60 minutes before the two main meals. The starting dose is 5 micrograms twice daily; after 4 weeks, the dose may be increased to 10 micrograms twice daily.
- Extended-release exenatide (e.g., Bydureon): Administered as a once-weekly subcutaneous injection at a dose of 2 mg per week.
Injections are given into the abdomen, thigh, or upper arm. Exenatide must not be administered intravenously or intramuscularly.
Side Effects
Exenatide can cause a range of side effects. The most common include:
- Nausea (especially at the start of treatment)
- Vomiting
- Diarrhea
- Constipation
- Injection site reactions (redness, swelling, itching)
- Hypoglycemia (especially when combined with sulfonylureas or insulin)
Rare but serious side effects include:
- Acute pancreatitis (inflammation of the pancreas): Patients experiencing persistent severe abdominal pain should seek immediate medical attention.
- Renal impairment
- Hypersensitivity reactions (allergic reactions)
Contraindications
Exenatide should not be used in patients with:
- Type 1 diabetes mellitus or diabetic ketoacidosis
- Severe renal impairment (GFR below 30 ml/min)
- Known hypersensitivity to the active substance
- Pregnancy and breastfeeding (due to insufficient safety data)
Drug Interactions
Because exenatide slows gastric emptying, it may affect the absorption of other orally administered medications. Patients who require rapid drug absorption (e.g., antibiotics, oral contraceptives) should take those medications at least one hour before the exenatide injection. Concomitant use with sulfonylureas or insulin may increase the risk of hypoglycemia.
References
- European Medicines Agency (EMA) - Product information for Byetta and Bydureon. www.ema.europa.eu
- American Diabetes Association (ADA) - Standards of Medical Care in Diabetes (2023). Diabetes Care, 46(Suppl 1).
- Drucker DJ, Nauck MA. The incretin system: glucagon-like peptide-1 receptor agonists and dipeptidyl peptidase-4 inhibitors in type 2 diabetes. Lancet. 2006;368(9548):1696-1705.
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Related search terms: Exenatide + Exenatid + Exenatide injection