Is Mounjaro the same as Ozempic?

No. Mounjaro is tirzepatide (a dual GIP + GLP-1 agonist from Eli Lilly); Ozempic is semaglutide (a GLP-1 agonist from Novo Nordisk). They're different molecules, both once-weekly injections approved for type 2 diabetes.

Which is better for weight loss, Mounjaro or Ozempic?

In weight-management trials the tirzepatide brand (Zepbound) averaged more weight loss than the semaglutide brand (Wegovy), including a 2025 head-to-head (SURMOUNT-5). Neither Mounjaro nor Ozempic is FDA-approved for weight loss itself; the weight brands are Zepbound and Wegovy. The right option is individualized — talk to your clinician.

Do Mounjaro and Ozempic have different side effects?

Both share the GLP-1 class effects — nausea, diarrhea, constipation — and both carry a boxed warning about thyroid C-cell tumors seen in rodents. Tirzepatide's dual mechanism can differ in tolerability for some people. Review the full FDA label and your history with a clinician.

Mounjaro vs Ozempic

By the pharmaranks editorial teamReviewed against FDA prescribing information (DailyMed) + pivotal trials (PubMed) sourcesUpdated Jul 3, 2026How we research

Different medicines. Mounjaro is tirzepatide, a dual GIP + GLP-1 agonist; Ozempic is semaglutide, a GLP-1 agonist. Both are once-weekly injections FDA-approved for type 2 diabetes.

At a glance

	Mounjaro	Ozempic
Active drug	tirzepatide	semaglutide
Drug class	Dual GIP + GLP-1 receptor agonist	GLP-1 receptor agonist
FDA-approved for	Type 2 diabetes	Type 2 diabetes
How it's taken	Once-weekly injection	Once-weekly injection
Maker	Eli Lilly	Novo Nordisk

Mounjarorating & safety →·Ozempicrating & safety →

The short version

Unlike Wegovy vs Ozempic (the same drug), Mounjaro and Ozempic are genuinely different medicines. Mounjaro (tirzepatide, Eli Lilly) acts on two gut hormones — GIP and GLP-1 — while Ozempic (semaglutide, Novo Nordisk) acts on one, GLP-1. Both are once-weekly injections FDA-approved for type 2 diabetes.

The key difference

The mechanism is the headline: tirzepatide's dual action is why it's often linked with greater average weight loss. For weight management specifically, the sibling brands are Zepbound (tirzepatide) and Wegovy (semaglutide) — and a 2025 head-to-head trial (SURMOUNT-5) found tirzepatide produced greater average weight loss than semaglutide. For diabetes, the choice is individualized: A1c goals, side effects, cost, and coverage all matter.

What the trials showed on weight

In weight-management trials, tirzepatide averaged about 20% body-weight reduction (SURMOUNT-1, 15 mg) versus about 15% for semaglutide (STEP 1), and outperformed it in a direct head-to-head (SURMOUNT-5). Diabetes-specific results differ and should be discussed with your clinician. These are trial averages, not promises — individual results and tolerability vary.

Bottom line

Mounjaro and Ozempic aren't interchangeable — they're different drugs. Tirzepatide (Mounjaro/Zepbound) tends to produce more weight loss on average, but the right choice depends on your diagnosis, response, side effects, and cost. This is general information, not medical advice.

Frequently asked

Is Mounjaro the same as Ozempic?: No. Mounjaro is tirzepatide (a dual GIP + GLP-1 agonist from Eli Lilly); Ozempic is semaglutide (a GLP-1 agonist from Novo Nordisk). They're different molecules, both once-weekly injections approved for type 2 diabetes.
Which is better for weight loss, Mounjaro or Ozempic?: In weight-management trials the tirzepatide brand (Zepbound) averaged more weight loss than the semaglutide brand (Wegovy), including a 2025 head-to-head (SURMOUNT-5). Neither Mounjaro nor Ozempic is FDA-approved for weight loss itself; the weight brands are Zepbound and Wegovy. The right option is individualized — talk to your clinician.
Do Mounjaro and Ozempic have different side effects?: Both share the GLP-1 class effects — nausea, diarrhea, constipation — and both carry a boxed warning about thyroid C-cell tumors seen in rodents. Tirzepatide's dual mechanism can differ in tolerability for some people. Review the full FDA label and your history with a clinician.

Compare more GLP-1 options

Wegovy vs Ozempic Zepbound vs Wegovy Zepbound vs Mounjaro Rybelsus vs Ozempic Mounjaro vs Wegovy All GLP-1 drugs compared →

Sources

General information, not medical advice, and not a substitute for your clinician. Efficacy figures are pivotal-trial averages — individual results, side effects, and cost vary. Only a licensed healthcare professional can choose, start, switch, or dose these medicines.