Starting Ozempic: Your First 8 Weeks, Week by Week
What really happens when you start Ozempic: the 0.25 mg starter month, the step to 0.5 mg, side effects to expect, and when to call your doctor.
3 min read
Key takeaways
Ozempic starts at 0.25 mg once a week for 4 weeks — a dose meant to let your stomach adjust, not to lower blood sugar much. Most people move to 0.5 mg in week 5. Nausea is most likely in the days after each step up and usually eases.
Ozempic at a glance
| Generic name | semaglutide |
|---|---|
| Made by | Novo Nordisk |
| Type | GLP-1 receptor agonist |
| Form | Prefilled pen, subcutaneous injection |
| How often | Once weekly |
| United States | FDA-approved (type 2 diabetes). Not approved for weight loss — Wegovy is the semaglutide brand for that. |
| Canada | Approved in Canada. Health Canada has also authorized generic semaglutide injections for type 2 diabetes (Dr. Reddy's, April 28, 2026; Apotex, May 1, 2026). |
Before your first pen
Your prescriber will check your history for medullary thyroid cancer or MEN 2, pancreatitis and eye problems from diabetes, because those change whether semaglutide is right for you. Ask three practical questions before you leave: which day of the week you will inject, what to do with your other diabetes medicines, and how you will check your blood sugar.
If you also take insulin or a sulfonylurea, your dose of those may need lowering — Ozempic plus either can cause low blood sugar.
Weeks 1–4: the starter dose
The 0.25 mg dose is a warm-up. Do not judge the medicine by your glucose readings this month. Pick a fixed injection day, inject into the stomach, thigh or upper arm, and rotate the spot each week.
- Eat smaller meals and stop as soon as you feel full — the medicine makes fullness arrive earlier.
- Go easy on fatty, fried and very sweet foods in the days after a dose increase.
- Sip water through the day; vomiting or diarrhea can dehydrate you and strain the kidneys.
- Tell your prescriber if nausea lasts — staying on a lower dose longer is a common fix.
Weeks 5–8: moving to 0.5 mg
This is the first dose that is expected to improve A1C. Side effects can flare for a few days after the step. If you need more control later, the label allows 1 mg and then 2 mg, each after at least 4 weeks on the dose before.
Red flags — get medical help
- Severe stomach pain that does not go away, with or without vomiting (possible pancreatitis).
- Pain in the upper right abdomen, fever or yellow skin (gallbladder).
- Signs of dehydration or passing much less urine.
- Sudden changes in vision if you have diabetic eye disease.
Before any surgery or procedure with sedation, tell the team you take Ozempic — food can stay in the stomach longer.
Making it routine
Set a phone reminder for injection day. An opened pen lasts 56 days at room temperature or in the fridge; keep unopened pens refrigerated and never freeze them. If you miss a dose, take it within 5 days; after that, skip it and keep your usual day.
Frequently asked questions
Will I lose weight on Ozempic?
Many people with type 2 diabetes lose some weight, but Ozempic is approved for blood sugar, heart and kidney protection — not for weight loss. Wegovy is the semaglutide brand approved for weight management.
Can I change my injection day?
Yes, as long as at least 2 days have passed since your last dose. Then keep the new day every week.
Why is my sugar not lower in the first month?
The 0.25 mg starter dose is mainly there to reduce side effects. Glucose lowering is expected from 0.5 mg onward.
Keep reading
Sources
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General information based on the official label. It does not replace advice from your prescriber or pharmacist.