exenatide vs semaglutide
Side-by-side comparison of exenatide and semaglutide Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
Byetta, Bydureon
Ozempic, Wegovy, Rybelsus
Byetta is a medicine that helps adults with type 2 diabetes control their blood sugar. It works along with diet and exercise.
Ozempic is a medicine that helps lower blood sugar in adults with type 2 diabetes. It can also lower the risk of heart problems in adults with both type 2 diabetes and heart disease.
Byetta helps adults with type 2 diabetes manage their blood sugar levels. It should be used with a healthy diet and regular exercise. This medicine helps to keep your blood sugar in a normal range.
Ozempic is used to improve blood sugar control in adults with type 2 diabetes, along with diet and exercise. It can also reduce the risk of major heart problems like heart attack, stroke, or death in adults who have both type 2 diabetes and heart disease. Ozempic has not been studied in patients with a history of pancreatitis, so other diabetes medicines may be better for you.
Byetta is a GLP-1 receptor agonist. It works by helping your body release insulin when your blood sugar is high. It also lowers the amount of sugar your liver makes.
Ozempic is a GLP-1 receptor agonist. It works by helping your body release insulin when your blood sugar is high. It also slows down how quickly food leaves your stomach.
- • Nausea
- • Low blood sugar
- • Vomiting
- • Diarrhea
- • Feeling jittery
- • Nausea
- • Vomiting
- • Diarrhea
- • Abdominal pain
- • Constipation
- High blood sugar 15,473
- Weight loss 12,125
- Feeling sick to your stomach 12,038
- Reduced appetite 5,644
- Low blood sugar 5,517
- Feeling sick to your stomach 10,666
- Throwing up 6,913
- Using the medicine for a purpose it's not approved for 6,532
- Loose, watery stools 6,093
- Not feeling hungry 4,428
Byetta may cause serious side effects, including pancreatitis. If you have severe stomach pain that won't go away, stop using Byetta and call your doctor right away. Never share your Byetta pen with anyone else, even if you change the needle.
Ozempic may cause thyroid C-cell tumors. Animal studies showed that semaglutide, the active ingredient in Ozempic, caused thyroid tumors in rodents. It is not known if Ozempic causes thyroid tumors in humans. You should not take Ozempic if you or your family have a history of medullary thyroid carcinoma (MTC) or if you have Multiple Endocrine Neoplasia syndrome type 2 (MEN 2). Tell your doctor if you notice a lump in your neck, have trouble swallowing, have trouble breathing, or have a hoarse voice that won't go away.
Talk to your doctor if you are pregnant or plan to become pregnant. Byetta should only be used during pregnancy if the benefit outweighs the risk to the baby. It is not known if Byetta passes into breast milk.
There is limited information about the safety of Ozempic during pregnancy. Ozempic may pose a risk to your unborn baby. Talk to your doctor if you are pregnant, plan to become pregnant, or are breastfeeding.
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How to Read This exenatide vs semaglutide Comparison
exenatide is classified in the GLP-1 Receptor Agonist drug class, while semaglutide sits within the GLP-1 Receptor Agonist class. Because both drugs share the same classification, they are often considered interchangeable in theory — but clinical outcomes rarely track that cleanly. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, exenatide has 50,797 submissions while semaglutide has 34,632. Those figures reflect cumulative reporting volume — not per-patient risk — so older, widely dispensed drugs typically look worse on count alone. No direct interaction between these two drugs is listed in our FDA-derived dataset, though co-prescription still warrants pharmacist review. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between exenatide and semaglutide — always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.