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HomeComparisonsSemaglutide vs Tirzepatide

Comparison

Semaglutide vs Tirzepatide

The two registered weight-management and diabetes medicines people most often compare. Both are lawful prescription products — the differences are mechanism, evidence and access.

Updated 1 June 20266 min read
Semaglutide
Tirzepatide
Mechanism
GLP-1 receptor agonist.
Dual GIP + GLP-1 receptor agonist.
ARTG status
Registered prescription medicine.
Registered prescription medicine.
Evidence
Large randomised trials for its indications.
Large randomised trials for its indications.
Common side effects
Gastrointestinal (nausea, constipation).
Gastrointestinal (nausea, constipation).
Access
Prescription + pharmacy dispensing.
Prescription + pharmacy dispensing.
Watch-out
“Compounded” copies sit outside approval.
“Compounded” copies sit outside approval.

The bottom line

Both are genuine, well-evidenced prescription medicines — a different category to the unapproved peptides elsewhere on this site. Which is appropriate (if any) is a clinical decision for your prescriber.

The shared caution is around unapproved “compounded” or online versions, which do not carry the same quality assurance as the registered products.

Frequently asked questions

Is tirzepatide “better” than semaglutide?

Weight studies have generally shown larger effects for tirzepatide, but “better” depends on the individual, the indication, tolerability and availability. That is a clinical judgement, not something to decide from a comparison table.

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Written by The Peptides.au editorial team
Editorial review Checked against current TGA, ARTG and AHPRA public guidance
Last updated 1 June 2026
Comparisons are general education, not a recommendation. Any decision should be made with a registered Australian health practitioner. See also Are peptides legal?

This is general education, not medical advice. Peptides.au does not sell, supply, recommend or promote any product or clinic. Always speak with a registered Australian health practitioner before making any health decision.