Byetta vs Bydureon BCise: Using Exenatide in 2026
Exenatide twice daily (Byetta) vs once weekly (Bydureon BCise): dosing, how to use each pen, availability limits in the US, and alternatives to ask about.
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Key takeaways
Exenatide was the first GLP-1 medicine. Byetta is injected twice daily before meals; Bydureon BCise once a week. Both are now hard to find in the US, so check supply with your pharmacist before relying on them.
Exenatide at a glance
| Generic name | exenatide |
|---|---|
| Made by | AstraZeneca |
| Type | GLP-1 receptor agonist |
| Form | Pen injection |
| How often | Twice daily (Byetta) or once weekly (Bydureon BCise) |
| United States | Largely withdrawn from the US market; availability is limited. Ask a pharmacist before relying on supply. |
| Canada | Check the Drug Product Database for current marketing status. |
Two very different schedules
- Byetta: 5 mcg twice daily within 60 minutes before the morning and evening meals; may increase to 10 mcg after a month.
- Bydureon BCise: 2 mg once weekly, same day each week, with or without meals.
Using Bydureon BCise
The autoinjector holds an extended-release suspension that must be mixed well. Follow the leaflet's instructions to shake it hard before injecting, then inject straight away. Uneven mixing means an incomplete dose.
Safety notes
Bydureon BCise carries the thyroid C-cell tumor boxed warning; twice-daily Byetta does not. Both can cause nausea, and both raise the risk of low blood sugar with insulin or a sulfonylurea.
If you cannot get it
Supply has been limited as the products were largely withdrawn from the US market. If your pharmacy cannot fill it, ask your prescriber about switching to another GLP-1 such as dulaglutide, semaglutide or generic liraglutide — never stop without a plan for your blood sugar.
Frequently asked questions
Is Byetta still sold?
Availability in the US is limited. Ask your pharmacist before relying on supply, and check the Drug Product Database in Canada.
Can Byetta be taken after meals?
No — it is meant to be injected within 60 minutes before meals. Skip a dose rather than taking it after eating.
Which is stronger, Byetta or Bydureon?
They use different schedules and formulations; your prescriber chooses based on your glucose pattern and routine.
Keep reading
Sources
Checked against these primary sources on .
General information based on the official label. It does not replace advice from your prescriber or pharmacist.