Table of Contents
- Common Ozempic Side Effects
- Serious Side Effects to Know About
- Pancreatitis
- Gallbladder Problems
- Diabetic Eye Changes
- Dehydration and Kidney Injury
- Allergic Reactions
- Thyroid Tumours
- Long-Term Effects and Muscle Loss
- How to Reduce Common Side Effects
- When to Contact a Doctor Straight Away
- Ozempic Compared With Other Medicines
- Who Should Be Careful
- Frequently Asked Questions
- Do Ozempic side effects go away?
- Can I stop Ozempic if side effects are bad?
- Are Ozempic side effects the same for everyone?
- Should I get my eyes checked?
- Book a Consultation
Quick answer: The most common Ozempic (semaglutide) side effects are nausea, vomiting, diarrhoea, stomach pain and constipation. These are usually mild to moderate and often ease as your body adjusts. Serious but less common effects include pancreatitis, gallbladder problems, worsening diabetic eye disease, kidney injury from dehydration and allergic reactions. Stop the medicine and contact a doctor urgently if you develop severe stomach pain, vision changes or signs of an allergic reaction.
Ozempic is a prescription medicine, and like all medicines it can cause side effects. Knowing what is common, what is serious and what to do about each one helps you stay safe and makes it easier to raise concerns early. This guide covers the main side effects, the warning signs that need urgent help and the questions to ask your doctor. For the treatment overview, see our Ozempic treatment guide.
Common Ozempic Side Effects
Stomach and digestive effects are the most frequently reported. In clinical trials, nausea, diarrhoea, vomiting, abdominal pain and constipation were the most common reactions. They are more likely during dose increases, and most people find they settle within a few weeks.
- Nausea: Often the first effect, and usually worst when starting or increasing the dose.
- Diarrhoea or constipation: Both can occur. Drink enough water and keep meals regular.
- Vomiting: Smaller, more frequent meals can help.
- Stomach pain or bloating: Usually mild, but report it if it becomes persistent.
- Fatigue, dizziness or changes in taste: Less common, but worth mentioning to your doctor.
Your doctor may adjust the dose more slowly if these effects are hard to manage. Do not change the dose yourself.
Serious Side Effects to Know About
These are less common but important. Contact a doctor urgently if you notice any of them.
Pancreatitis
Inflammation of the pancreas has been reported with GLP-1 medicines, including Ozempic. Warning signs include severe pain in the upper stomach that may spread to the back, nausea or vomiting that does not settle, and a fast heart rate. The prescribing information says to stop Ozempic if pancreatitis is suspected and not to restart it if pancreatitis is confirmed. Read the FDA prescribing information for Ozempic for the full warning.
Gallbladder Problems
Gallstones and gallbladder inflammation have occurred in some people taking semaglutide. Signs include pain in the upper right abdomen, fever, yellow skin or eyes, and pale stools. Tell your doctor promptly if these symptoms appear, because gallbladder studies may be needed.
Diabetic Eye Changes
In people with diabetes, Ozempic can be linked to worsening diabetic retinopathy, especially if you already have eye damage from diabetes. The risk appeared higher in people who already had retinopathy and in those whose blood sugar improved quickly. Report blurred or changed vision straight away. Regular eye checks are important for anyone with diabetes taking this medicine.
Dehydration and Kidney Injury
Severe vomiting or diarrhoea can cause dehydration, which can lead to kidney problems. Seek advice if you cannot keep fluids down or pass very little urine.
Allergic Reactions
Serious allergic reactions, including swelling of the face, lips, tongue or throat, difficulty breathing, or a severe rash, need emergency care. Stop the medicine and seek help immediately.
Thyroid Tumours
Ozempic carries a boxed warning about thyroid C-cell tumours, including medullary thyroid carcinoma. It is not recommended if you have a personal or family history of medullary thyroid carcinoma or Multiple Endocrine Neoplasia syndrome type 2. Report a lump or swelling in the neck, difficulty swallowing, or persistent hoarseness.
Long-Term Effects and Muscle Loss
Weight loss on any medicine can include some loss of muscle as well as fat. Adequate protein intake and resistance exercise help protect muscle. Some people also notice loose skin or facial volume changes after losing weight. Our guides on Ozempic face and loose skin after weight loss explain these changes and what can help.
How to Reduce Common Side Effects
- Eat smaller meals and stop when you feel full.
- Avoid very fatty, fried or heavy foods, which often worsen nausea.
- Drink water regularly, especially if you have diarrhoea or vomiting.
- Keep up fibre and fluids if constipation develops.
- Avoid lying down straight after eating.
For a month-by-month view of what many people experience during treatment, read what to expect during Wegovy treatment. Wegovy and Ozempic share the same active ingredient, semaglutide, so many side effects overlap.
When to Contact a Doctor Straight Away
- Severe, persistent stomach pain, especially spreading to the back
- Vomiting that prevents you from keeping fluids down
- Yellowing of the skin or eyes, or pale stools with abdominal pain
- Sudden changes in vision
- Swelling of the face, lips or throat, or difficulty breathing
- A lump or swelling in the neck, or difficulty swallowing
Ozempic Compared With Other Medicines
Ozempic and Mounjaro both belong to the GLP-1 family or related groups and share many stomach-related side effects. Their profiles differ in some details. Our comparison of Mounjaro vs Ozempic vs Wegovy explains the differences. For Mounjaro side effects specifically, read Mounjaro side effects: what is normal and what is temporary.
Who Should Be Careful
Speak to your doctor before starting if you have diabetic retinopathy, a history of pancreatitis or gallbladder disease, severe kidney problems, or if you are pregnant or planning pregnancy. Our guide on who is suitable for GLP-1 treatment and who should avoid it covers the general principles, which also apply to Ozempic.
Frequently Asked Questions
Do Ozempic side effects go away?
Stomach-related side effects often improve within a few weeks, particularly after the dose has settled. Serious side effects need prompt medical attention and should not be ignored.
Can I stop Ozempic if side effects are bad?
Do not stop or change your dose without advice, unless you have severe symptoms, in which case seek urgent help. Your doctor can adjust the plan safely.
Are Ozempic side effects the same for everyone?
No. Side effects vary by person, dose and other health conditions. Keep a note of symptoms and share them at follow-up.
Should I get my eyes checked?
If you have diabetes, yes. Regular eye examinations are recommended, especially if you already have diabetic eye disease or your blood sugar changes quickly.
Book a Consultation
If you have questions about side effects or want to review whether Ozempic suits you, speak to a doctor at CLEO clinic. Contact our team through the contact page.
This article is for general information only and does not replace advice from a qualified doctor. Ozempic is a prescription medicine. Product information varies by country, so check the Malaysian product information and speak to your doctor before starting or changing treatment.
