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Tirzepatide vs Ozempic in South Africa

Tirzepatide (sold here as Mounjaro) and Ozempic (semaglutide) are the two most-searched weight-loss injections in SA. Here's how the molecules, results and prices compare.

TirzepatideOzempic
Active ingredientTirzepatide (GIP + GLP-1)Semaglutide (GLP-1)
SA brandMounjaroOzempic / Wegovy
Monthly costR2 800–R5 500R1 438–R3 225
DosingOnce weeklyOnce weekly
Average weight lossHighest in trialsHigh

The key difference is mechanism: tirzepatide activates two hormone receptors (GIP and GLP-1), while semaglutide activates one (GLP-1). That is the leading explanation for tirzepatide's larger average weight loss in trials. Ozempic, however, is more established, more widely stocked, and is registered for diabetes (used off-label for weight loss), whereas tirzepatide as Mounjaro is the newer arrival in SA.

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Tirzepatide

The newer tirzepatide option, often cited for strong results. Distributed by Aspen in SA as single-dose vials (a KwikPen is under SAHPRA evaluation); a typical month is about R4 000 for four vials.

Tirzepatide details

Ozempic

The original semaglutide pen and the most recognised name in the category. Doses titrate from 0.25 mg up to 2 mg weekly — the 2 mg maintenance dose can run to roughly R6 000/month. Cheaper generic semaglutide is now starting to enter the SA market.

Ozempic details
FAQ

Frequently asked questions

Is tirzepatide or semaglutide better for weight loss?
In head-to-head research tirzepatide (Mounjaro) has produced greater average weight loss than semaglutide (Ozempic/Wegovy), likely because it acts on two hormones rather than one. Suitability is still individual — your doctor decides what fits you.
What is the price difference in South Africa?
Tirzepatide as Mounjaro is indicatively R2 800–R5 500 a month; semaglutide as Ozempic is R1 438–R3 225. Confirm current pharmacy prices.
Are tirzepatide and semaglutide the same thing?
No. Semaglutide is a GLP-1 medicine (Ozempic, Wegovy). Tirzepatide is a dual GIP/GLP-1 medicine (Mounjaro). Different molecules, both weekly injections.

Sources: South African Health Products Regulatory Authority (SAHPRA) registration data, the approved package inserts, and public pharmacy price listings. Last reviewed 2026-05-30. No information here is medical advice.