What Is Ozempic?
Ozempic is a once-weekly injection used to help manage type 2 diabetes. The active ingredient is semaglutide, a medicine that copies the action of a natural gut hormone your body already makes. It comes as a pre-filled pen that you inject under the skin, usually once a week on the same day. In South Africa it is a prescription-only medicine, which means a registered doctor has to assess you and prescribe it before you can start.
You may have heard about Ozempic mostly in the context of weight loss. That is worth understanding properly, and we cover it below, but the starting point is simpler: Ozempic is a diabetes medicine that also happens to reduce appetite.
The active ingredient: semaglutide
Semaglutide belongs to a group of medicines called GLP-1 receptor agonists. GLP-1 (glucagon-like peptide-1) is a hormone your gut releases after you eat. It tells the pancreas to release insulin when your blood sugar rises, and it sends signals to the brain and stomach that affect how full you feel. Semaglutide is designed to act like that hormone, but in a longer-lasting way, which is why one injection can keep working across a whole week.
Because it nudges several systems at once, semaglutide does a few things together. It helps lower blood sugar, it slows down how quickly the stomach empties, and it reduces appetite. The blood sugar effect is why it is approved for diabetes. The appetite and stomach effects are the reason many people also lose weight while taking it. If you want the mechanism in more detail, read how Ozempic works.
What Ozempic is approved for
Ozempic is registered and approved for type 2 diabetes. In practical terms, a doctor may consider it for an adult whose blood sugar is not well controlled with other measures, often alongside diet, exercise and sometimes other diabetes medicines. It is not insulin, and it is not a stimulant. It works with your body's own insulin response rather than replacing it.
Using Ozempic purely for weight loss, in someone who does not have diabetes, is considered off-label. That does not automatically make it wrong, but it is a decision for a doctor to make with you. There is a separate, higher-dose semaglutide product called Wegovy that is specifically approved for weight management. If weight loss is your main goal, the honest comparison is on our page covering Ozempic vs Wegovy.
The pen and how dosing works
Ozempic is supplied as a pre-filled pen. You do not draw the medicine up yourself. The pen holds several weeks of doses, you attach a fine needle for each injection, dial the dose and inject into the stomach, thigh or upper arm. Most people find the needle is short and thin enough that the injection is mild.
The dose is not the same from the first day. Treatment usually starts low, at 0.25 mg once a week, and then steps up gradually over a number of weeks. Starting low and building up slowly is deliberate. It gives your body time to settle and helps reduce the nausea and other gut side effects that are most common in the early weeks. Your doctor decides the schedule and the dose you settle on. There is a fuller breakdown on our Ozempic dosage page.
Never adjust your own dose, share a pen or use someone else's prescription. The stepping-up schedule exists for a reason, and the right dose depends on your health, not on how quickly you want results.
What to expect while taking it
The most common side effects are gastrointestinal: nausea, reduced appetite, and sometimes vomiting or constipation. For most people these are strongest early on and ease over time as the body adjusts, which is part of why the dose is increased slowly. Weight change on Ozempic varies a lot from person to person. In studies, weight loss is commonly cited in the region of 5 to 15 percent of body weight over about a year, but that is a general figure and it depends on the dose, the person and what else they are doing.
One point worth being clear about: the effects are tied to taking the medicine. If you stop, appetite tends to return, and weight that was lost often comes back. Ozempic is not a short course you finish, it is an ongoing treatment that a doctor reviews with you. You can read more about tolerability on our Ozempic side effects page.
Who makes Ozempic, and a note on this site
Ozempic is a registered trademark of its manufacturer. This site, Ozempic SA, is an independent information property. We are not the manufacturer and we are not pretending to be. What we are is a plain-English resource run by Online Doctor SA, so that if you decide Ozempic might be right for you, there is a straightforward and legitimate way to be assessed. Consultations and prescriptions are handled by Online Doctor SA, with HPCSA-registered doctors and SAPC-registered pharmacy partners.
Thinking about starting?
Ozempic is prescription-only in South Africa and must be used under a registered doctor. The next step is not buying a pen, it is a proper consultation to check whether it suits your health, your history and your goals.
Already on Ozempic and need a repeat? Start an existing-user consultation.
This page is general information, not medical advice. Whether Ozempic is appropriate for you is a decision to make with an HPCSA-registered doctor who knows your full medical history.