May 27, 2017
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(exenatide) Injection


BYETTA (exenatide) is a synthetic peptide that was originally identified in the lizard Heloderma suspectum. Exenatide differs in chemical structure and pharmacological action from insulin, sulfonylureas (including D-phenylalanine derivatives and meglitinides), biguanides, thiazolidinediones, alpha-glucosidase inhibitors, amylinomimetics and dipeptidyl peptidase-4 inhibitors.

Exenatide is a 39-amino acid peptide amide. Exenatide has the empirical formula C184H282N50O60S and molecular weight of 4186.6 Daltons. The amino acid sequence for exenatide is shown below.

H-His-Gly-Glu-Gly-Thr-Phe-Thr-Ser-Asp-Leu-Ser-Lys-Gln-Met-Glu-Glu-Glu-Ala-Val-Arg-Leu -Phe-Ile-Glu-Trp-Leu-Lys-Asn-Gly-Gly-Pro-Ser-Ser-Gly-Ala-Pro-Pro-Pro-Ser-NH2

BYETTA (exenatide injection) is supplied for SC injection as a sterile, preserved isotonic solution in a glass cartridge that has been assembled in a pen-injector (pen). Each milliliter (mL) contains 250 micrograms (mcg) synthetic exenatide, 2.2 mg metacresol as an antimicrobial preservative, mannitol as a tonicity-adjusting agent, and glacial acetic acid and sodium acetate trihydrate in water for injection as a buffering solution at pH 4.5. Two prefilled pens are available to deliver unit doses of 5 mcg or 10 mcg. Each prefilled pen will deliver 60 doses to provide for 30 days of twice daily administration (BID).

What are the possible side effects of Byetta (Byetta Prefilled Pen)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using exenatide and call your doctor at once if you have a serious side effect such as:

  • swelling, weight gain, feeling short of breath, urinating less than usual or not at all;
  • drowsiness, confusion, mood changes, increased thirst, diarrhea;
  • dull pain in your middle or lower back;
  • severe pain in your upper stomach spreading to your back, vomiting; or
  • low blood sugar...

Read All Potential Side Effects and See Pictures of Byetta »

What are the precautions when taking exenatide injection (Byetta)?

See also Warning section.

Before using exenatide, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: stomach/intestinal disorders (such as gastroparesis, digestion problems), kidney disease, disease of the pancreas (pancreatitis), stones in your gallbladder (gallstones).

You may experience blurred vision, headache, dizziness, or drowsiness due to extremely low or high blood sugar levels. Do not drive, use machinery, or do any activity that requires alertness or clear vision until you are...

Read All Potential Precautions of Byetta »

Last reviewed on RxList: 1/31/2017
This monograph has been modified to include the generic and brand name in many instances.

Byetta - User Reviews

Byetta User Reviews

Now you can gain knowledge and insight about a drug treatment with Patient Discussions.

Here is a collection of user reviews for the medication Byetta sorted by most helpful. Patient Discussions FAQs

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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