A GLP-1 receptor agonist
Exenatide
An injectable GLP-1 medicine for type 2 diabetes that lowers blood sugar and curbs appetite.
What is Exenatide?
Exenatide is an injectable GLP-1 receptor agonist used to improve blood sugar control in type 2 diabetes. It comes as a twice-daily form (Byetta) taken before meals and a longer-acting once-weekly form (Bydureon). It works with the body's own gut hormones to lower blood sugar and reduce appetite.
Education and reference only. This is a plain-language guide to Exenatide — it deliberately contains no doses. Doses depend on the person, the brand and the reason for treatment, and belong with your prescriber. Always check the BNF, the product labelling (SmPC) and follow medical advice.
What it is
Exenatide is a GLP-1 receptor agonist for type 2 diabetes. It is given as an injection under the skin. Byetta is a short-acting form taken twice a day before meals, while Bydureon is a long-acting form taken once a week.
How it works
It mimics GLP-1, a hormone released by the gut after eating. It prompts the pancreas to release insulin when blood sugar is high, lowers glucagon, slows stomach emptying and reduces appetite, all of which help bring blood sugar down.
Company & origin
Originated / developed by: AstraZeneca.
What it treats
Conditions Exenatide is used for
Practical use
How to take Exenatide
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- Inject under the skin of the tummy, thigh or upper arm.
- If using the twice-daily form, inject before your morning and evening meals.
- If using the weekly form, inject on the same day each week.
- Rotate the injection site to protect the skin.
- Do not inject after a meal, as the short-acting form is meant for before eating.
- Store as directed; many forms need refrigeration before first use.
Weighing it up
Advantages & disadvantages of Exenatide
Advantages
- Lowers blood sugar while also tending to reduce appetite and weight.
- Low risk of hypos when used on its own.
- A once-weekly option is available for convenience.
Disadvantages
- It is an injection, and the twice-daily form ties dosing to meals.
- Nausea and other gut effects are common at the start.
- It is not suitable for everyone, including those with significantly reduced kidney function.
Practical use
Good to know
Which form you use changes how it is taken: the twice-daily version is injected before meals, while the weekly version is taken on the same day each week. Nausea is common at first and tends to settle. As with other medicines in this family, it carries a class warning about inflammation of the pancreas.
Who should not take it / use with caution
- People who have had an allergic reaction to exenatide.
- Those with a personal or family history of medullary thyroid cancer or MEN 2.
- People with severe kidney impairment or severe gut disease.
- It is not recommended in pregnancy or breastfeeding.
Monitoring
- Blood sugar control (HbA1c) is reviewed periodically.
- Kidney function is checked, as it is affected by reduced kidney function.
- Be alert for symptoms of pancreatitis.
Side effects
- Nausea, vomiting or diarrhoea, especially early on.
- Reduced appetite and indigestion.
- Injection-site reactions, including small lumps with the weekly form.
- Rarely, inflammation of the pancreas (severe, persistent tummy pain needs urgent help).
Key interactions
- Combining it with insulin or a sulfonylurea raises hypo risk, so doses may need adjusting.
- By slowing stomach emptying it can affect how other tablets are absorbed.
- Tablets that need careful timing may need to be taken at a different time.
Available as: Available as pre-filled pens for use under the skin, in twice-daily and once-weekly forms.
Answers
Exenatide: frequently asked questions
What is the difference between Byetta and Bydureon?
Byetta is short-acting and injected twice a day before meals, while Bydureon is long-acting and injected once a week. Both contain exenatide.
When do I inject the twice-daily form?
The short-acting form is injected before your morning and evening meals, not after eating.
Can exenatide cause a hypo?
On its own the risk is low, but it rises if combined with insulin or a sulfonylurea, in which case those doses may be lowered.
Does it help with weight?
Many people lose some weight because it reduces appetite, though the effect varies between individuals.
Is it safe with kidney problems?
It is affected by kidney function and is not recommended if your kidneys are significantly impaired, so your kidneys are checked before and during treatment.
The wider class
About GLP-1 receptor agonists
Exenatide belongs to the glp-1 receptor agonists class. For how the class as a whole works, its shared safety principles and monitoring, see the full guide.
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Authoritative sources
- BNF
- NICE CKS
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