Tirzepatide vs. Ozempic: What's the difference?

How do tirzepatide and Ozempic work?

Both tirzepatide and Ozempic are GLP-1 medications, which means they help boost the level of the GLP-1 hormone in the body. These hormones help regulate appetite, as well as levels of insulin and blood sugar. While these two drugs are extremely similar in nature, there are a few minor differences in how they function.

Both medications lower A1c levels by increasing insulin secretion in a glucose-dependent manner and slowing glucose absorption, Marlee Bruno, a board-certified physician assistant and founder of Mind Body & Soul Medical in Pensacola, Florida, told us.

But, she went on to say: “Tirzepatide has shown superior glycemic control compared to Ozempic in head-to-head trials. In the SURPASS-2 trial, Tirzepatide lowered A1c by up to 2.4%, compared to 1.9% with semaglutide.”

Tirzepatide

Tirzepatide is the first drug of its type that mimics two naturally occurring hormones: GIP (glucose-dependent insulinotropic polypeptide) and GLP-1 (glucagon-like peptide-1). GLP-1 slows gastric emptying, enhances satiety and increases insulin release, said Bruno. GIP works to boost insulin sensitivity and further reduce appetite.

This dual-action mechanism works to enhance both satiety and metabolic regulation. Early clinical trials show promising results for both diabetes and weight management, Bruno said.

In the SURMOUNT-1 clinical trial, participants without diabetes lost up to 22.5% of their body weight over 72 weeks using tirzepatide, which was a groundbreaking result in obesity treatment and management. This makes the drug an excellent Ozempic alternative.

Ozempic

Originally approved for Type 2 diabetes management, Ozempic is the popular brand-name version of the GLP-1 drug semaglutide. It helps regulate blood sugar (which is great for those with Type 2 diabetes) while also slowing gastric emptying and increasing feelings of fullness, leading to reduced calorie intake.

Wegovy is another semaglutide drug that has recently been approved by the FDA for chronic weight management. In the Semaglutide Treatment Effect in People with Obesity (STEP) clinical trials, semaglutide led to an average weight loss of 14.9% in adults with obesity when paired with lifestyle changes.

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What are the side effects of tirzepatide and Ozempic?

If there’s one thing all GLP-1 drugs have in common, it’s unpleasant side effects. Most patients taking these drugs report persistent gastrointestinal side effects.

Side effects of weight loss drugs

For the majority of people taking GLP-1 medications, side effects will lessen over time. “Things like adjusting dosage, trying a different brand and supplementing with vitamin B12 can all help make the experience more pleasant,” Bruno told us.

Vitamin B12 taken alongside the GLP-1 drug can help support energy levels and reduce symptoms like fatigue and nausea, said Bruno. “It's a simple yet effective step that can make a big difference in treatment experience and tolerance!”

For most patients, side effects are mild to moderate and typically improve over time or with dose adjustments. Nausea is the most frequently reported symptom with both medications, but it's often manageable, especially when patients start with a lower dose and gradually increase.

How much do tirzepatide and Ozempic cost?

All GLP-1 medications are expensive without insurance. That’s a big drawback, since oftentimes, they aren’t covered — and that’s especially the case when used for weight loss rather than diabetes (which often is approved and covered).

But in November 2023, tirzepatide received FDA approval to be used for weight loss when combined with at least one weight-related medical issue. Ozempic, on the other hand, is not currently approved by the FDA for weight loss. So if you’re planning on using it for that purpose, you’ll likely have to pay for it out of pocket.

Without insurance, you can expect to pay between $1,000 and $1,200 per month for tirzepatide in the form of Zepbound or Mounjaro. In February of 2025, Zepbound’s manufacturer introduced a Self Pay Journey Program that allows those without commercial insurance to purchase single-dose vials at reduced prices.

Zepbound Self Pay Journey Program pricing

How much does Ozempic cost? This drug clocks in at a slightly lower price point of $1,000 to $1,200.

Manufacturers offer online savings programs for Mounjaro, Zepbound and Ozempic, which can drastically lower the price, but these can’t be combined with insurance.

Which medication is more effective for weight loss?

In head-to-head studies, tirzepatide consistently outperforms semaglutide. Patients on higher doses of tirzepatide lost up to 22.5% of body weight, while those on semaglutide (Ozempic) lost around 14.9%. The additional GIP action gives tirzepatide the edge in terms of metabolic impact, Bruno said. This makes tirzepatide the stronger choice for patients whose primary goal is significant weight loss.

» MORE: 6 weight loss medication options