First Week · Day 1 of 7

Day 1 on Ozempic: What Happens After Your First Shot

Day-by-day, plain-English guidance for your first week — what's common, what to eat, and when something needs a doctor.

Last reviewed Jul 28, 2026Reviewed against FDA labeling & clinical guidanceSources & limitations below

Quick answer

On day 1, most people feel little different. Some notice mild nausea, tiredness, or soreness at the injection site within a few hours. Appetite changes usually come later in the week. Serious reactions are rare — seek urgent care for trouble breathing, facial/throat swelling, or severe stomach pain.

What's typical on day 1 (illustrative)

Appetite suppressionbuilds over week 1

Nausea likelihoodusually mild

Tirednessoften minimal

What's happening today

Semaglutide is long-acting and builds up slowly, so day 1 is usually quiet. The medicine begins signalling to your brain and gut to slow digestion and reduce appetite, but you may not feel much of that yet.

Hour-by-hour

Time since shot	What's common
0–2 hours	Usually no change. Mild soreness, redness, or a small bump at the injection site is common and fades.
2–6 hours	Some people feel mild nausea or slight queasiness. Many feel completely normal.
6–12 hours	A subtle sense of early fullness at meals for some. Keep portions small.
24 hours	Most feel normal. It's very common to feel anxious about whether it's 'working' — that's expected this early.

How you might feel

Appetite

Often unchanged on day 1. Reduced hunger typically builds over the first week.

Energy

Usually normal. A few people feel mildly tired.

Sleep

Usually unaffected.

Digestion

Possible mild nausea, or nothing at all.

What to eat & drink

Prioritize:

Lean protein (eggs, chicken, fish, Greek yogurt)Broth-based soupsPlain crackers or toastGinger tea or ginger chewsWater & electrolytes

Go easy on:

Fried & greasy foodsVery large portionsHeavy alcoholUltra-sugary foods & drinksRich, creamy sauces

Hydration: Aim for roughly 2 litres of water, sipped through the day. Good hydration helps blunt early nausea.

Activity

Normal light activity is fine. A gentle walk can ease queasiness. No need to change your routine.

When to call your doctor

Most day-1 experiences are mild. Seek prompt medical care for:

Trouble breathing, or swelling of the face, lips, or throat
Severe abdominal pain, especially if it radiates to your back
Persistent vomiting or signs of dehydration

Not sure about a symptom?

"Is this normal? Should I worry?"

A quick guide to whether a symptom is commonly reported or worth a call. Not a diagnosis — when in doubt, contact your clinician.

What are you noticing?

How severe?

Frequently asked questions

Is it normal to feel nothing on day 1?

Yes — this is the most common experience. Semaglutide builds up gradually, so many people notice appetite changes only after a few days.

When will my appetite drop?

For many people, reduced hunger becomes noticeable between days 3 and 7. It often strengthens after each dose increase.

My injection site is sore or has a small bump — is that okay?

Mild soreness, redness, or a small lump is common and usually settles within a day or two. Watch for spreading redness, warmth, or pus, which can signal infection.

Can I eat normally today?

You can, but smaller, protein-forward meals are gentler on your stomach while your body adjusts.

Should I feel full already?

Some people do; many don't yet. Both are normal on day 1.

Day 2Continue to Day 2

Related tools & guides

References

U.S. Food & Drug Administration — Ozempic (semaglutide) prescribing information.
National Institute of Diabetes and Digestive and Kidney Diseases (NIH) — GLP-1 receptor agonists.
American Diabetes Association — Standards of Care in Diabetes.

Medical disclaimer. This page is general education about common early experiences and is not medical advice or a prediction for your situation. Individual responses vary. Start and adjust GLP-1 medication only under a licensed clinician, and seek care for severe or worrying symptoms.