Quick Answer
Ozempic (semaglutide) commonly causes gastrointestinal side effects like nausea, vomiting, diarrhea, and constipation, especially when starting treatment or increasing the dose. Most of these are mild to moderate and improve within a few weeks. Rare but serious risks include pancreatitis, gallbladder problems, kidney issues, and a possible risk of thyroid tumors seen in animal studies. Contact your doctor immediately if you experience severe abdominal pain, signs of an allergic reaction, or vision changes.
What Is Ozempic?
Ozempic is the brand name for semaglutide, a GLP-1 receptor agonist originally approved by the FDA to help manage blood sugar in adults with type 2 diabetes. It's administered as a once-weekly injection. A related but higher-dose version, Wegovy, is approved specifically for weight management.
Common Side Effects
These typically occur when starting Ozempic or increasing the dose, and often subside as your body adjusts:
- Nausea — the most frequently reported side effect
- Vomiting
- Diarrhea
- Constipation
- Stomach pain or bloating
- Reduced appetite
- Fatigue
Managing common side effects:
- Eat smaller, more frequent meals
- Avoid high-fat or greasy foods
- Stay hydrated
- Eat slowly and stop when full
Serious Side Effects — Seek Medical Attention
Call your doctor promptly if you notice:
- Signs of pancreatitis: severe, persistent abdominal pain that may radiate to your back
- Signs of gallbladder problems: pain in the upper right abdomen, fever, yellowing of skin or eyes
- Signs of kidney problems: decreased urination, swelling in legs/ankles
- Vision changes, particularly in people with existing diabetic retinopathy
- Signs of a severe allergic reaction: facial/throat swelling, difficulty breathing
Boxed Warning: Thyroid Tumors
Ozempic carries an FDA boxed warning based on animal studies showing an increased risk of thyroid C-cell tumors. It is not known whether this occurs in humans. Ozempic should not be used by people with a personal or family history of medullary thyroid carcinoma (MTC) or Multiple Endocrine Neoplasia syndrome type 2 (MEN 2).
When to Call Your Doctor vs. Emergency Room
| Situation | Action |
|---|---|
| Mild nausea, occasional diarrhea | Manage at home, monitor |
| Persistent vomiting, unable to keep fluids down | Call your doctor same day |
| Severe abdominal pain radiating to back | Seek urgent care |
| Facial/throat swelling, trouble breathing | Call 911 / emergency services |
[DRAFT STATUS: Ready for pharmacist review. Verify all claims against current FDA prescribing information before publishing.]
