The strongest weight loss prescription available in Australia right now is semaglutide, sold under the brand name Wegovy for weight loss and Ozempic for type 2 diabetes. A newer option, tirzepatide (Mounjaro), is showing even stronger results in clinical trials and is gaining access in Australia through specialist pathways.
These are not appetite suppressants from the 1990s. They work on the brain and gut in ways that older medications never did. The clinical data behind them is serious, and the results people are getting are real.
Here is what you need to know before you talk to a doctor.
What Is the Strongest Weight Loss Prescription Available in Australia?
Semaglutide at 2.4mg weekly (Wegovy) is the current gold standard for prescription weight loss in Australia. The STEP 1 trial published in the New England Journal of Medicine found that people using semaglutide lost an average of 14.9% of their body weight over 68 weeks. That is roughly 15kg for someone who weighs 100kg.
Tirzepatide (Mounjaro) targets two hormones instead of one, GLP-1 and GIP, and the SURMOUNT-1 trial showed average weight loss of up to 22.5% of body weight. That is a significant jump. In my experience reviewing the research, tirzepatide is the most effective pharmacological weight loss tool we have seen in clinical trials to date.
Both medications work by mimicking gut hormones that signal fullness to the brain. They slow how fast your stomach empties, reduce hunger, and lower the reward response to food. You eat less because you genuinely want less, not because you are white-knuckling it.
Is Semaglutide (Ozempic) Available as a Weight Loss Prescription in Australia?
Yes, but with an important distinction. Ozempic is TGA-approved in Australia for type 2 diabetes management, not specifically for weight loss. Wegovy, the higher-dose version of semaglutide designed for weight loss, received TGA approval in 2023.
What I found was that many GPs were prescribing Ozempic off-label for weight loss before Wegovy was approved. That still happens. Off-label prescribing is legal in Australia when a doctor judges it appropriate for the patient.
Supply has been a real issue. Ozempic faced significant shortages in Australia from 2022 through 2024 because global demand exploded. The TGA placed restrictions on new Ozempic prescriptions for weight loss to protect supply for people with type 2 diabetes. Wegovy has its own supply chain and is the preferred route for weight loss prescriptions now.
Tirzepatide (Mounjaro) is available in Australia through the TGA’s Special Access Scheme and via compounding pharmacies in some cases. access is expanding but it is not as straightforward as getting a standard PBS prescription yet.
Do You Need a Prescription for Weight Loss Injections in Australia?
Yes. Semaglutide and tirzepatide are Schedule 4 prescription-only medicines in Australia. You cannot buy them over the counter or legally import them without a valid Australian prescription.
There are online telehealth services operating in Australia that make getting a prescription more accessible. You complete a health questionnaire, have a video or phone consultation with a registered doctor, and if you meet the criteria, they issue a prescription. That prescription goes to a pharmacy and you receive the medication.
The criteria doctors use typically include a BMI of 30 or above, or a BMI of 27 or above with a weight-related health condition like high blood pressure, sleep apnoea, or type 2 diabetes. These are the same criteria used in the major clinical trials.
Compounded versions of semaglutide exist in Australia and are cheaper, but they are not TGA-approved products. The TGA has issued warnings about compounded semaglutide. If you go that route, understand you are using a product that has not gone through the same regulatory process as Wegovy or Ozempic.
What Are the Side Effects of Prescription Weight Loss Medications in Australia?
The most common side effects of semaglutide and tirzepatide are gastrointestinal. Nausea, vomiting, diarrhoea, and constipation affect a significant portion of users, especially in the first few weeks as the dose increases.
In the STEP trials, around 44% of semaglutide users reported nausea. Most cases were mild to moderate and reduced over time. About 5% of participants stopped the medication because of side effects.
What I saw in the research is that the slow dose escalation protocol, starting low and increasing every four weeks, exists specifically to reduce these side effects. Doctors who rush the titration schedule see more dropouts.
More serious but less common side effects include:
- Pancreatitis, inflammation of the pancreas, which requires stopping the medication immediately
- Gallbladder problems, including gallstones, which occur at higher rates with rapid weight loss generally
- A theoretical risk of thyroid C-cell tumours seen in rodent studies, which is why these medications carry a warning for people with a personal or family history of medullary thyroid carcinoma
- Muscle loss, which is a real concern when losing weight rapidly without resistance training
The muscle loss point matters more than most people realise. Studies show that roughly 25 to 40% of weight lost on GLP-1 medications can come from lean mass, not just fat. This is why combining these medications with a structured resistance training program and adequate protein intake is not optional, it is essential for long-term health outcomes.
When I tried to find data on what happens to people who stop these medications without lifestyle changes in place, the picture was clear. The STEP 4 trial showed that people who stopped semaglutide regained two thirds of their lost weight within one year. The medication manages the condition. It does not cure it.
How Much Do Prescription Weight Loss Medications Cost in Australia?
This is where things get expensive. Wegovy is not currently listed on the Pharmaceutical Benefits Scheme (PBS) for weight loss in Australia, which means you pay full price.
Current costs in Australia as of 2024 and 2025:
- Wegovy (semaglutide 2.4mg) costs approximately $400 to $500 per month at full price
- Ozempic (semaglutide, lower doses) costs around $130 to $160 per month without PBS subsidy for weight loss use
- Mounjaro (tirzepatide) through specialist or telehealth pathways costs approximately $350 to $600 per month depending on dose and supplier
- Compounded semaglutide from compounding pharmacies can cost $100 to $250 per month but carries the regulatory caveats mentioned above
If you have type 2 diabetes and your doctor prescribes Ozempic for that condition, the PBS subsidy applies and the cost drops to the standard PBS co-payment, around $30 for general patients and $7.70 for concession card holders.
The cost is a genuine barrier. Over a year, you are looking at $4,800 to $6,000 for Wegovy at full price. This is why the combination of medication with structured lifestyle intervention matters so much. You want the changes you make during the medication period to stick when you eventually come off it.
Can a GP Prescribe Weight Loss Medication in Australia?
Yes. A general practitioner can prescribe semaglutide and other weight loss medications in Australia. You do not need a specialist referral for an initial prescription, though some GPs will refer complex cases to an endocrinologist or bariatric physician.
In my experience reviewing how this works in practice, GPs vary widely in their comfort level with these medications. Some are very up to date and will assess you thoroughly and prescribe if appropriate. Others are more cautious or less familiar with the current evidence base.
Telehealth services that specialise in weight management have made access more consistent. Doctors working in these services see weight loss cases all day and tend to be more current on the protocols.
What a GP will assess before prescribing includes your BMI, existing health conditions, current medications (some interact with GLP-1 agonists), personal and family history of thyroid cancer or pancreatitis, and your goals and expectations.
Be honest in that consultation. These medications work best as part of a broader plan, and a good doctor will want to know what else you are doing to support the weight loss.
What Is the Strongest Weight Loss Prescription in Australia When You Factor In the Full Picture?
The strongest weight loss prescription in Australia is the one that works inside a system that supports it. Tirzepatide produces the highest average weight loss in trials. Semaglutide is more accessible right now. Both are significantly more effective than older options like phentermine or orlistat.
But here is the left-of-centre view that most weight loss content skips over.
First, these medications suppress appetite so effectively that many people dramatically under-eat protein. I found that this is one of the main drivers of muscle loss on GLP-1 medications. If you are eating 800 calories a day because you have no appetite, and most of that is not protein, you will lose muscle at a rate that damages your metabolism and physical function. The medication does not protect you from that. You have to be deliberate about protein intake even when you are not hungry.
Second, the rebound data suggests that the people who keep the weight off long-term are the ones who built genuine behavioural and physiological changes during the medication period, not the ones who just rode the appetite suppression. The medication buys you a window. What you do in that window determines the long-term outcome.
Third, resistance training while on these medications does something that cardio alone does not. It signals to your body to preserve muscle during the caloric deficit. Studies on GLP-1 users who combined resistance training with the medication showed significantly better body composition outcomes than those who did cardio or nothing. This is not a minor point. It changes the entire result.
Working with an online personal trainer during a medication-assisted weight loss period gives you the structure to make those changes stick. The medication handles hunger. The training and nutrition coaching handles body composition and long-term metabolic health. Those two things together produce outcomes that neither does alone.
Frequently Asked Questions
What weight loss injections are available in Australia?
Semaglutide (Wegovy, Ozempic) and tirzepatide (Mounjaro) are the main injectable weight loss options available in Australia. Both require a prescription. Liraglutide (Saxenda) is also TGA-approved for weight management and is an older GLP-1 option with a daily injection schedule instead of weekly.
Is Ozempic the same as Wegovy?
Both contain semaglutide but at different doses. Ozempic tops out at 2mg weekly and is approved for type 2 diabetes. Wegovy goes up to 2.4mg weekly and is approved specifically for weight management. The higher dose produces greater weight loss on average.
How long do you stay on weight loss medication in Australia?
Most clinical guidelines treat obesity as a chronic condition, meaning long-term or indefinite use may be appropriate for some people. The STEP 4 trial data showing significant weight regain after stopping supports this view. The decision depends on individual health factors, cost, and whether lifestyle changes have been embedded during the treatment period.
Can you get weight loss medication online in Australia?
Yes. Several TGA-compliant telehealth platforms operate in Australia and can issue prescriptions for weight loss medications after a medical consultation. The prescription is then filled at a pharmacy. This is legal and regulated, provided the prescribing doctor is registered with AHPRA.
Does private health insurance cover weight loss medication in Australia?
Generally no. Private health insurance in Australia covers hospital and extras, not prescription medications. Weight loss medications not listed on the PBS are an out-of-pocket cost regardless of your insurance level.