GLP-1 Therapy · Safety

Ozempic Side Effects — What to Expect and Manage

Most Ozempic (semaglutide) side effects are gastrointestinal: nausea, early fullness, constipation or loose stools, reflux and burping. They peak in the days after each dose increase and usually settle within two to three weeks. Serious but uncommon risks include pancreatitis, gallbladder disease and dehydration.

A practical, clinician-written guide to semaglutide side effects — what is normal, what to do about it, and the red flags that need same-day review — from Dr. Sanjay Sachdev (MBBS, MNAMS), South Delhi.

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The first four weeks

Expect appetite to drop sharply and portion tolerance to fall. Nausea and burping are the usual complaints. Eat smaller and more slowly, cut fried and very fatty food, keep fluids up, and do not push the dose upwards while symptoms are still active.

What we do instead of stopping

Most people who quit GLP-1 therapy do so because the dose was escalated too fast. Holding a strength for an extra month, splitting meals, adding fibre or a short antacid course, and treating constipation early keeps the majority on treatment comfortably.

Red flags — stop and call the same day

Severe constant upper abdominal pain going through to the back; right-upper abdominal pain with fever or yellow eyes; vomiting that stops you drinking; fainting or very low sugars; a new neck lump, hoarseness or difficulty swallowing.

Protecting muscle, hair and bone while you lose weight

We track weight and waist alongside protein intake and strength training, and check iron, vitamin D, B12 and thyroid function. Losing 0.5–1% of body weight a week with adequate protein preserves lean mass; faster loss usually does not.

Frequently asked

8 answers
What are the most common Ozempic side effects?
Nausea, reduced appetite, early fullness, constipation or loose stools, reflux, burping and mild fatigue. They are dose-dependent, worst in the first days after each increase, and usually settle within two to three weeks.
How long does nausea on semaglutide last?
Typically a few days to two weeks after each dose step. Smaller meals, less fat and fried food, slower eating, adequate water, and holding the current dose for an extra two to four weeks before escalating are what fix it.
What are the serious side effects I should watch for?
Severe persistent abdominal pain radiating to the back (possible pancreatitis), right-upper abdominal pain with fever or jaundice (gallbladder), persistent vomiting with dehydration, and a new neck lump or hoarseness. Stop the drug and seek review the same day.
Does Ozempic cause muscle loss or 'Ozempic face'?
Rapid weight loss without enough protein and resistance training costs lean mass, which shows in the face and in strength. We set a protein target, add twice-weekly strength work, and slow the rate of loss if lean mass is falling.
Can semaglutide cause hypoglycaemia?
On its own, rarely. Combined with insulin or sulfonylureas, yes — those doses usually need reducing when GLP-1 therapy starts. Any diabetic patient starting it should have a glucose-monitoring plan.
Will it affect my kidneys?
Not directly, but dehydration from vomiting or diarrhoea can raise creatinine. We check kidney function at baseline and during titration, and pause the drug during any acute vomiting illness.
What about hair loss and constipation?
Both are common with rapid weight loss rather than the drug itself. Protein, iron, vitamin D and B12 status, fibre intake and hydration usually explain and resolve them.
Who should not take Ozempic?
Anyone with personal or family history of medullary thyroid cancer or MEN2, previous pancreatitis, severe gastroparesis, or who is pregnant, planning pregnancy or breastfeeding. We screen for all of these before the first dose.

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Consultations are by appointment at Friends Colony East and Maharani Bagh, South Delhi.

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