Wanting to lose 5 kg alone is usually not a reason to go on Ozempic. Semaglutide treatment is generally meant for people with a body mass index, or BMI, of 30 or more, or 27 or more with a weight-related health condition. If you’re below those ranges, lifestyle changes and a GP check are better places to start.
A safe, workable target is often about 0.25 to 0.75 kg per week. At that pace, losing 5 kg may take around two to five months without medicine. Your GP can check if the goal is healthy, look for medical causes of weight gain and help you pick a plan that lasts.
Why does your health matter more than the 5 kg target?
Semaglutide is a prescription drug used to treat type 2 diabetes and, in another product and dose, help with long-term weight control. A doctor won’t decide if it suits you just by looking at how many kilos you want to lose. Your BMI, waist size, health history, current medicines and risk of weight-related disease matter more.
The main weight-loss trials didn’t study people who simply wanted to shed a little cosmetic weight. They mostly included adults with a BMI of at least 30, or at least 27 plus a weight-related condition. A 2024 review covered 3,087 participants. Among those with a reported BMI category, 94% had obesity. A 2025 oral semaglutide trial used similar entry rules.
That leaves a clear gap in the evidence. Research shows semaglutide can cut weight in people with overweight or obesity. It doesn’t show that a short course is a wise choice for a healthy person who wants to lose 5 kg. Promising the same benefit in that setting based on the trials would be a leap.
BMI isn’t a full health test. It can’t measure body fat, muscle mass or where fat is stored. Still, it gives a GP a useful first check. Blood pressure, blood sugar, cholesterol, sleep, joint pain and family history can then fill in the picture. Someone with type 2 diabetes and a 5 kg goal needs a different review from a healthy person who gained weight after a holiday.
How does Ozempic change appetite and weight?
Ozempic contains semaglutide, a GLP-1 receptor agonist. GLP-1 means glucagon-like peptide-1. The body releases this gut hormone after you eat. It works through the glucagon-like peptide-1 receptor to help control blood sugar, slow stomach emptying and signal fullness.
Semaglutide copies part of that effect for longer. Many people feel full sooner, think about food less and find smaller meals easier. Weight drops when this creates a steady energy deficit. The medicine doesn’t melt fat from one chosen spot. And it can’t replace good nutrition, movement, sleep or habits that help the result last.
Ozempic is approved for diabetes care in suitable patients. Semaglutide products made for long-term weight control have their own approved uses, doses and supply rules. Brand names aren’t interchangeable instructions. A GP or pharmacist should confirm which product, if any, suits the medical need.
What do the large trials tell us about a small goal?
Large trials show semaglutide can lead to major weight loss in the groups studied. In STEP 1, 1,961 adults with overweight or obesity lost an average of 14.9% of their starting weight after 68 weeks. The placebo group lost 2.4%, creating a 12.4 percentage-point difference. In STEP 5, average loss was 15.2% with semaglutide and 2.6% with placebo after 104 weeks.
Those numbers are group averages from long treatment periods. They aren’t a forecast for one person. Some people lost less. Others lost more. A 5 kg drop also means different things at different starting weights. It equals 5% for someone who weighs 100 kg and 8.3% for someone who weighs 60 kg.
The trial setup matters just as much as the headline result. STEP 3 included 611 adults who had an initial low-calorie diet and 30 counselling visits over 68 weeks. STEP 8 included 338 adults who also had diet and activity support. The medicine was one part of a planned program, not a stand-alone fix.
Here’s something often missed: a modest goal doesn’t make the treatment modest. The same checks, dose increases, side effect risk and follow-up still apply. So a small target may bring too much burden for too little benefit when someone has little weight-related health risk.
Why is a short course a poor fit for quick cosmetic loss?
Semaglutide was studied as ongoing treatment for a chronic condition. It wasn’t made as a quick reset before a wedding, holiday or photo shoot. Stopping when the scale hits a chosen number doesn’t remove the forces that shaped appetite and eating before treatment.
The STEP 1 extension followed 327 participants after semaglutide was stopped. They had lost 17.3% by week 68, then regained 11.6 percentage points over the next year. That doesn’t mean everyone will regain weight. But it does show that much of the benefit can fade once treatment ends.
STEP 4 adds to that worry. Participants first finished a 20-week semaglutide run-in. Researchers then compared ongoing treatment with withdrawal. The study treated weight maintenance as part of therapy, instead of assuming the job was done once someone hit a target.
Many articles miss this too: the key question isn’t whether semaglutide could move the scale by 5 kg. It probably could for many eligible patients. The real question is whether the health gain would make long-term treatment, cost, check-ups and possible side effects worthwhile.
Which risks should you discuss before seeking a prescription?
Common side effects affect the gut. Nausea, vomiting, diarrhoea, constipation and stomach pain can disrupt eating, training and daily life. Starting on a low dose and raising it slowly may help, but it won’t remove the risk.
Tell your GP about severe or lasting stomach symptoms, past pancreatitis, kidney problems, eye disease linked to diabetes and any history of gallbladder disease. Fast weight loss itself can raise the chance of gallstones. Your clinician also needs a full list of medicines and supplements because eating less, vomiting or slower stomach emptying may affect your wider care.
Semaglutide products carry a warning about thyroid C-cell tumours seen in animal studies. People with a personal or family history of medullary thyroid cancer or multiple endocrine neoplasia type 2 shouldn’t use them. Multiple endocrine neoplasia is an inherited condition that can cause tumours in glands that make hormones. Tell your GP if either condition is in your family history.
Pregnancy plans matter too because weight-loss treatment isn’t used during pregnancy. A prescriber can tell you when semaglutide must be stopped before trying to conceive. Get medical care quickly for severe, lasting belly pain, repeated vomiting, signs of dehydration or symptoms of a serious allergic reaction.
Could losing 5 kg without medication be realistic?
Yes. For many otherwise healthy adults, losing 5 kg without a weight-loss drug is realistic. A pace of about 0.25 to 0.75 kg per week gives you roughly two to five months. Daily scale readings shift with fluid, salt, bowel contents and the menstrual cycle, so follow the weekly trend instead of treating every change as fat loss.
First, check if 5 kg is the right target. If you’re already in a healthy range, pushing lower may hurt strength, energy or freedom around food without improving your health. Waist size, fitness, blood pressure and blood test results may be better goals than one number on a scale.
Cut food too hard and hunger climbs while training quality drops. The first scale change can look impressive because stored carbohydrate and water fall. It rarely lasts. A smaller energy deficit works more slowly, but leaves room for protein, fibre and regular meals.
Build meals around a good protein source and foods high in fibre. Pick portions you could keep eating after you reach the goal. Resistance training helps protect muscle during weight loss. Walking and other steady movement can burn more energy without piling on harsh workouts.
Sleep shapes the plan as well. Short or broken sleep can make hunger tougher to control and exercise less tempting. If loud snoring, daytime tiredness or shift work is part of the issue, tell your GP. Treating the cause may do more than forcing a tighter diet.
What should a GP check before you decide?
A good check starts with why your weight changed. Your GP may look at eating habits, activity, sleep, alcohol use, stress, pregnancy history and medicines that can affect appetite or weight. Some symptoms may point to a health problem that needs its own review.
The check should also cover your history with dieting. Losing and regaining weight many times can make another strict plan a poor fit. Binge eating, purging, fear of food or severe distress about your body needs care that protects both physical and mental health. An appetite-suppressing medicine shouldn’t hide those warning signs.
If semaglutide is medically suitable, ask what success means beyond losing 5 kg. Talk about how long treatment may last, how side effects will be handled and what would make the plan stop. Ask how you’ll protect muscle, get enough nutrients and keep watch on any health conditions.
Cost and access are part of the choice too. Treatment can be hard to keep up if it depends on medicine you can’t get regularly. A maintenance plan should be ready before the first dose, especially because withdrawal research found substantial regain.
How can you make a safer decision now?
Don’t buy semaglutide from an unverified seller or use someone else’s pen. A prescription review protects you from the wrong product, unsafe doses, poor storage and missed health risks. It also gives you a clear way to get help if symptoms start.
Before your visit, record two weeks of meals, drinks, sleep, movement and morning weight. Add your waist measurement, current medicines and key family health history. That gives your GP far more useful detail than the sentence “I want to lose 5 kg.”
Use the visit to pick between two clear paths. If your BMI and health risks support medical weight care, ask for a full talk about semaglutide’s benefits, limits and long-term role. If they don’t, set a realistic food and activity plan, then check the trend after four to six weeks.
Your next step is to book a GP assessment and judge Ozempic by your health needs, not by the 5 kg number alone.
Frequently asked questions about Can I go on Ozempic to lose 5kg?
How many kg can I lose in 3 months with Ozempic?
Weight loss varies, but some people may lose about 3% to 5% of their body weight in three months. Your results depend on your dose, diet, activity, and health.
What disqualifies you from getting Ozempic?
Ozempic may not be suitable if you are pregnant, allergic to it, or have a personal or family history of certain thyroid cancers. A doctor must also check conditions such as pancreas, kidney, stomach, or eye problems before prescribing it.
How much weight can I lose in 6 weeks on Ozempic?
There is no fixed amount, and weight loss may be small during the first six weeks because treatment starts at a low dose. Some people lose a few kilograms, while others lose little or none.
Can you take Ozempic to lose belly fat?
Ozempic may reduce body fat as you lose weight, but it cannot target belly fat alone. It should only be used when prescribed by a doctor, along with healthy food and regular activity.
Sources
- Wilding JPH, Batterham RL, Calanna S, Davies M, Van Gaal LF, Lingvay I, et al. (2021) “Once-Weekly Semaglutide in Adults with Overweight or Obesity” The New England journal of medicine. PMID: 33567185
- Wilding JPH, Batterham RL, Davies M, Van Gaal LF, Kandler K, Konakli K, et al. (2022) “Weight regain and cardiometabolic effects after withdrawal of semaglutide: The STEP 1 trial extension” Diabetes, obesity & metabolism. PMID: 35441470
- Rubino D, Abrahamsson N, Davies M, Hesse D, Greenway FL, Jensen C, et al. (2021) “Effect of Continued Weekly Subcutaneous Semaglutide vs Placebo on Weight Loss Maintenance in Adults With Overweight or Obesity: The STEP 4 Randomized Clinical Trial” JAMA. PMID: 33755728
- Garvey WT, Batterham RL, Bhatta M, Buscemi S, Christensen LN, Frias JP, et al. (2022) “Two-year effects of semaglutide in adults with overweight or obesity: the STEP 5 trial” Nature medicine. PMID: 36216945
- Wadden TA, Bailey TS, Billings LK, Davies M, Frias JP, Koroleva A, et al. (2021) “Effect of Subcutaneous Semaglutide vs Placebo as an Adjunct to Intensive Behavioral Therapy on Body Weight in Adults With Overweight or Obesity: The STEP 3 Randomized Clinical Trial” JAMA. PMID: 33625476
- Moiz A, Levett JY, Filion KB, Peri K, Reynier P, Eisenberg MJ (2024) “Long-Term Efficacy and Safety of Once-Weekly Semaglutide for Weight Loss in Patients Without Diabetes: A Systematic Review and Meta-Analysis of Randomized Controlled Trials” The American journal of cardiology. PMID: 38679221
- Wharton S, Lingvay I, Bogdanski P, Duque do Vale R, Jacob S, Karlsson T, et al. (2025) “Oral Semaglutide at a Dose of 25 mg in Adults with Overweight or Obesity” The New England journal of medicine. PMID: 40934115
- Rubino DM, Greenway FL, Khalid U, O’Neil PM, Rosenstock J, Sørrig R, et al. (2022) “Effect of Weekly Subcutaneous Semaglutide vs Daily Liraglutide on Body Weight in Adults With Overweight or Obesity Without Diabetes: The STEP 8 Randomized Clinical Trial” JAMA. PMID: 35015037
