Weight Loss Medication in Australia 2026: All Options Compared

Australia now has more effective weight loss medication options than at any point in medical history. The GLP-1 revolution of the 2020s has produced drugs that achieve outcomes previously only seen with surgery — but navigating the options, costs, and eligibility criteria isn't always straightforward. This guide covers everything.

Weight Loss Medications Available in Australia in 2026

The Therapeutic Goods Administration (TGA) has approved several medications specifically for weight management. They fall into two broad categories:

GLP-1 and Dual GIP/GLP-1 Medications (the modern standard)

• Tirzepatide (Mounjaro) — weekly injection; TGA-approved for weight management
• Semaglutide (Wegovy 2.4mg) — weekly injection; TGA-approved for weight management
• Liraglutide (Saxenda 3mg) — daily injection; TGA-approved for weight management

Older Weight Loss Medications

• Orlistat (Xenical/Alli) — oral tablet; available by prescription and as lower-dose OTC
• Phentermine — oral; short-term use only (typically 3 months maximum)
• Naltrexone/bupropion (Contrave) — oral combination; TGA-approved for weight management

Note: Ozempic (semaglutide 0.5–2mg) is TGA-approved for type 2 diabetes, not weight management — but is widely and legally prescribed off-label by Australian GPs for this purpose when clinically appropriate.

Which Weight Loss Medication Is Most Effective?

The evidence base for modern GLP-1 medications is the strongest ever produced for any non-surgical weight management intervention:

Medication	Avg. Weight Loss	Key Trial
Mounjaro 15mg (tirzepatide)	~21%	SURMOUNT-1, NEJM
Wegovy 2.4mg (semaglutide)	~15%	STEP-1, NEJM
Ozempic 2mg (semaglutide)	~10–12%	STEP-2, SUSTAIN trials
Saxenda 3mg (liraglutide)	~5–8%	SCALE trials
Orlistat (Xenical)	~3–5%	Multiple RCTs
Phentermine	~3–5%	Short-term use only

The RACGP's updated obesity management guidelines now position GLP-1 receptor agonists as first-line pharmacotherapy for eligible patients, reflecting the strength of this evidence. Diabetes Australia similarly highlights GLP-1 medications as transformative in weight and metabolic health management.

What Does Each Medication Cost in Australia?

As of 2026, none of the GLP-1 class medications are PBS-listed for weight management. All are private prescriptions at full pharmacy cost:

• Mounjaro (tirzepatide): $180–$350/month depending on dose
• Wegovy (semaglutide 2.4mg): $200–$280/month
• Ozempic (semaglutide 0.5–2mg): $120–$220/month
• Saxenda (liraglutide 3mg): $200–$300/month
• Orlistat (Xenical) prescription: $60–$80/month
• Orlistat (Alli) OTC: ~$30–$40/month
• Contrave (naltrexone/bupropion): $80–$120/month

Ozempic is PBS-subsidised for type 2 diabetes in eligible patients (currently ~$31 per script for general patients, $7.70 for concession cardholders). This subsidy does not apply to weight management prescriptions.

Who Is Eligible for Weight Loss Medication in Australia?

General eligibility for GLP-1 medications, consistent with TGA approvals and RACGP guidelines:

• BMI ≥ 30 kg/m² (obesity), or
• BMI ≥ 27 kg/m² with at least one weight-related health condition (type 2 diabetes, hypertension, dyslipidaemia, obstructive sleep apnoea, PCOS, osteoarthritis)
• Adults aged 18 or over
• No contraindications (history of medullary thyroid carcinoma, MEN2, prior pancreatitis, or pregnancy)

No specialist referral is required. A GP can assess, prescribe, and monitor all weight loss medications available in Australia.

How to Access Weight Loss Medication in Australia

1. Book a GP consultation — telehealth or in-person, both equally valid for prescribing
2. Clinical assessment — your GP reviews BMI, health history, current medications, and contraindications
3. Prescription issued — electronic or paper, fillable at any Australian pharmacy
4. Ongoing monitoring — regular follow-ups to track progress, manage side effects, and adjust dose

Weight Loss GP Australia offers bulk-billed telehealth consultations for eligible patients under Medicare telehealth item numbers — meaning the GP appointment costs $0 out-of-pocket.

Frequently Asked Questions — Weight Loss Medication Australia

What is the most effective weight loss medication in Australia in 2026?

Based on clinical trial evidence, Mounjaro (tirzepatide) currently produces the greatest average weight loss — approximately 21% of body weight at 15mg over 72 weeks. Wegovy (semaglutide 2.4mg) achieves approximately 15%. Both significantly outperform older medications such as orlistat or phentermine.

Do I need a specialist to get weight loss medication in Australia?

No. A GP can prescribe all approved weight loss medications in Australia without an endocrinologist or specialist referral. This makes access significantly faster and simpler than many patients expect.

Are weight loss injections covered by Medicare in Australia?

The medication cost is not covered by Medicare for weight management. However, the GP consultation may be bulk billed under Medicare telehealth item numbers for eligible patients. For general health information about weight management, Healthdirect Australia is a good starting resource.

How long do you stay on weight loss medication?

GLP-1 medications are generally prescribed for long-term or ongoing use. Clinical evidence consistently shows that stopping treatment leads to significant weight regain within 12 months. The RACGP treats obesity as a chronic condition requiring ongoing management — similar to hypertension or high cholesterol.

What is the cheapest weight loss medication in Australia?

Orlistat (available OTC as Alli from ~$30/month) is the most affordable option, but produces the least weight loss (~3–5%). For meaningful results, the GLP-1 class is far more effective at a higher monthly cost. The most cost-effective option for you depends on your individual goals and clinical profile.