Description
What Is Ozempic 1 mg?
Ozempic 1 mg is a once-weekly injectable medicine containing semaglutide, a glucagon-like peptide-1 (GLP-1) receptor agonist. It is supplied as a prefilled, multi-dose pen that delivers the 1 mg maintenance dose, commonly in packs of pens with needles. Made by Novo Nordisk, it is used, alongside diet and exercise, to improve blood sugar control in adults with type 2 diabetes.
Ozempic is a prescription-only medicine. By mimicking the natural hormone GLP-1, it lowers blood sugar mainly after meals, supports weight reduction, and — in people with established heart disease — reduces the risk of major cardiovascular events. Its once-weekly pen offers convenient long-term treatment. The 1 mg strength is a full maintenance dose reached after gradual dose titration.
Boxed Warning — Thyroid C-Cell Tumours
Semaglutide caused thyroid C-cell tumours (including medullary thyroid carcinoma, MTC) in rodents at clinically relevant exposures. It is not known whether Ozempic causes such tumours, including MTC, in humans. Ozempic is contraindicated in patients with a personal or family history of MTC and in those with Multiple Endocrine Neoplasia syndrome type 2 (MEN 2). Patients should be counselled about the risk and the symptoms of thyroid tumours, such as a neck mass, difficulty swallowing, breathlessness, or persistent hoarseness.
Active Ingredient & Mechanism of Action
The active ingredient is semaglutide, a long-acting GLP-1 receptor agonist with a half-life of about one week, allowing once-weekly dosing. GLP-1 is an incretin hormone released by the gut that helps regulate blood sugar.
Semaglutide binds to and activates the GLP-1 receptor, which stimulates insulin secretion in a glucose-dependent way (only when blood sugar is high), suppresses excess glucagon, and slows gastric emptying. Together these actions lower blood sugar with a low risk of hypoglycaemia when used alone, and the slowed stomach emptying and reduced appetite support weight loss.
Approved Indications
Ozempic is indicated, as an adjunct to diet and exercise, to improve glycaemic control in adults with type 2 diabetes mellitus. It may be used alone when metformin is unsuitable, or combined with other glucose-lowering medicines including metformin, sulfonylureas, SGLT2 inhibitors, and insulin. It is also used to reduce the risk of major adverse cardiovascular events in adults with type 2 diabetes and established cardiovascular disease, and to slow kidney disease progression in some patients. It is not for type 1 diabetes or diabetic ketoacidosis.
Dosage & Administration
Ozempic is injected once weekly, on the same day each week, at any time of day, with or without food. Treatment starts at 0.25 mg once weekly for 4 weeks (a starting dose for tolerability, not for glucose control), then increases to 0.5 mg once weekly. After at least 4 weeks at 0.5 mg, the dose can be increased to 1 mg once weekly for additional control, which is a common maintenance dose. A 2 mg dose is available for further intensification. The dose is adjusted by your doctor based on response and tolerance.
How to Administer Ozempic
Inject Ozempic subcutaneously into the abdomen, thigh, or upper arm, rotating sites. Attach a new needle for each injection, check the flow before first use of a new pen, dial the prescribed dose, and inject, holding the button until the dose counter shows 0. The pen contains multiple weekly doses. Follow the Instructions for Use supplied with the pen, do not share pens between people, and dispose of needles safely in a sharps container.
Missed Dose
If you miss a dose, inject it as soon as possible within 5 days of the missed dose. If more than 5 days have passed, skip the missed dose and take the next one on your regular scheduled day. Do not take a double dose to make up for a missed one. You can change your weekly injection day as long as at least 3 days (72 hours) have passed since the last dose.
Overdose
Overdose may cause severe nausea, vomiting, and low blood sugar. There is no specific antidote; because semaglutide acts for a long time, a prolonged period of observation and supportive treatment for the symptoms may be needed. Contact your doctor or emergency services if a much larger dose than prescribed is injected.
Storage Conditions
Before first use, store Ozempic in a refrigerator at 2°C to 8°C, away from the freezer compartment; do not freeze. After first use, the pen can be kept for up to 6 weeks at room temperature (below 30°C) or in a refrigerator. Keep the cap on to protect from light, do not freeze, and do not use if the solution is not clear and colourless. Keep out of the reach and sight of children and do not use after the expiry date.
Contraindications
Ozempic is contraindicated in patients with a personal or family history of medullary thyroid carcinoma (MTC), in those with Multiple Endocrine Neoplasia syndrome type 2 (MEN 2), and in anyone with a serious hypersensitivity to semaglutide or any component. It is not indicated for type 1 diabetes or diabetic ketoacidosis. The prescriber must confirm suitability before starting.
Warnings & Precautions
Beyond the thyroid warning, important precautions include acute pancreatitis (stop if suspected), diabetic retinopathy complications (rapid blood-sugar improvement can temporarily worsen retinopathy — monitor those with a history), hypoglycaemia when used with insulin or a sulfonylurea, acute kidney injury from dehydration due to vomiting or diarrhoea, gallbladder disease, and hypersensitivity reactions. It is not recommended in severe gastrointestinal disease.
Common & Serious Side Effects
The most common side effects are gastrointestinal: nausea, vomiting, diarrhoea, abdominal pain, and constipation, usually mild to moderate and easing over time. Other effects include reduced appetite, fatigue, and injection-site reactions. Serious effects requiring prompt attention include severe, persistent abdominal pain (possible pancreatitis), symptoms of low blood sugar, sudden vision changes, signs of a severe allergic reaction, gallbladder symptoms, and symptoms of thyroid tumours such as a neck lump or hoarseness.
Drug Interactions
Because semaglutide slows gastric emptying, it can affect the absorption of oral medicines taken at the same time. Used with insulin or a sulfonylurea, it increases the risk of hypoglycaemia, so those doses may need reducing. Caution applies with oral medicines that have a narrow therapeutic range. Inform your doctor of all medicines you take, including warfarin and other treatments, so timing and doses can be reviewed.
Required Tests & Monitoring
Treatment is guided by blood glucose and HbA1c. Kidney function should be monitored, especially with severe gastrointestinal reactions. Patients with a history of diabetic retinopathy need eye monitoring when glucose falls rapidly. Watch for symptoms of pancreatitis and thyroid tumours; routine calcitonin or thyroid ultrasound is of uncertain value. Those on insulin or a sulfonylurea require blood-sugar monitoring for hypoglycaemia.
Diet & Lifestyle Support
Ozempic works best alongside a healthy diet and regular activity. Smaller, balanced meals can reduce nausea, especially when starting or increasing the dose. Staying well hydrated protects the kidneys if you have vomiting or diarrhoea. Continue blood-sugar monitoring and the rest of your diabetes care — blood pressure, cholesterol, and foot and eye checks — and follow your care team’s overall plan.
Expected Timeline for Improvement
Blood-sugar lowering begins within the first weeks, with the fuller effect on HbA1c seen over about 3 months. The starting 0.25 mg dose is for tolerance and does not give full glucose control; benefit builds as the dose is titrated to 0.5 mg and then 1 mg. Weight reduction also develops gradually. If targets are not met after an adequate trial, the dose may be increased or other therapy added, as judged by your doctor.
Effect on Other Medications & Conditions
By slowing stomach emptying, Ozempic can alter absorption of oral medicines, and with insulin or sulfonylureas it raises hypoglycaemia risk. Conditions such as a history of pancreatitis, diabetic retinopathy, gallbladder disease, kidney impairment, or severe gastrointestinal disease influence its use and monitoring. All coexisting conditions and concurrent medicines should be reviewed by the prescriber before and during treatment.
When to See a Doctor
Seek urgent care for severe, persistent abdominal pain, especially if it spreads to the back or comes with vomiting (possible pancreatitis), and for signs of a severe allergic reaction such as swelling of the face or throat and difficulty breathing. Contact your doctor about a neck lump, persistent hoarseness or trouble swallowing, sudden changes in vision, symptoms of low blood sugar, or ongoing vomiting or diarrhoea with reduced urination.
Use in Special Populations
Ozempic is for adults. It should be avoided in pregnancy and stopped at least 2 months before a planned pregnancy because of its long action; breastfeeding requires a benefit-risk discussion. It can be used across kidney function including moderate impairment, with monitoring; experience in severe impairment is limited. No dose adjustment is required for older age, though tolerance should be observed, and it is not recommended in severe gastrointestinal disease.
Who Should Avoid Ozempic?
Ozempic should be avoided by anyone with a personal or family history of medullary thyroid carcinoma, MEN 2, or serious hypersensitivity to semaglutide. It is not suitable for type 1 diabetes or diabetic ketoacidosis, and is not recommended in severe gastrointestinal disease. Particular caution — and sometimes avoidance — applies in those with a history of pancreatitis, significant gallbladder disease, or advanced diabetic retinopathy.
Frequently Asked Questions
What is Ozempic used for? Ozempic (semaglutide) improves blood-sugar control in adults with type 2 diabetes, supports weight loss, and reduces cardiovascular risk in those with heart disease.
How often is it injected? Once weekly, on the same day each week, at any time of day, into the abdomen, thigh, or upper arm.
Why does the dose start low? The 0.25 mg starting dose is for tolerability, not glucose control; it is titrated up to 0.5 mg and then 1 mg over several weeks.
Does Ozempic cause weight loss? Many people lose weight, as semaglutide slows stomach emptying and reduces appetite, though results vary.
What if I miss a dose? Inject within 5 days of the missed dose; if more than 5 days have passed, skip it and resume your normal schedule.
Medical Review & Author Note
This page was medically reviewed by Dr. Abdallah Fouad, Clinical Nutrition Specialist with over 25 years of experience. The content is provided for educational purposes to help patients and caregivers understand how Ozempic (semaglutide) is used, its benefits, and its risks. It does not replace the personalized advice of your treating physician or pharmacist.
Medical Disclaimer
Ozempic is a prescription-only medicine that must be prescribed and monitored by a qualified physician. This content is for general information only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your doctor or pharmacist before starting, changing, or stopping any medication.
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