Mounjaro vs. Trulicity: How Do They Compare?

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 MounjaroTrulicity
Drug classGlucagon-like peptide 1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP) receptor agonistGLP-1 receptor agonist
Mechanism of actionTargets GLP-1 and GIP receptorsTargets GLP-1 receptors only
Year of FDA approval and indicationType 2 diabetes (2022)Type 2 diabetes (2014)
Appropriate useApproved for use in adults onlyApproved for use in children 10 years and older
AdministrationOnce weekly injection under the skinOnce weekly injection under the skin
Available strengths2.5 milligrams (mg), 5 mg, 7.5 mg, 10 mg, 12.5 mg, 15 mg0.75 mg, 1.5 mg, 3 mg, 4.5 mg

Understanding Mounjaro

Mounjaro is a dual-acting GLP-1/GIP receptor agonist. It is designed to mimic the effects of two natural hormones involved in blood sugar regulation. It works by stimulating insulin release when blood sugar levels are high, slowing down digestion to prevent blood sugar spikes and reducing appetite.

By targeting both GLP-1 and GIP receptors, Mounjaro offers a dual-action approach that may provide greater blood sugar control and weight loss compared to similar medications.

Uses

Mounjaro is approved to improve blood sugar control in adults with type 2 diabetes in addition to healthy eating and exercise.

One of its key advantages is its ability to significantly lower hemoglobin A1C levels, a key indicator of long-term blood sugar control. Clinical trials have shown that Mounjaro often leads to greater reductions in hemoglobin A1C compared to other diabetes medications, making it an effective choice for many patients.

The active ingredient in Mounjaro promotes weight loss, which can be particularly helpful for those with type 2 diabetes. Its once-weekly dosing also provides a convenient yet effective approach to improving overall health in people with type 2 diabetes.

Side Effects

The most commonly reported Mounjaro side effects include:

Serious side effects may include:

Those with a personal or family history of medullary thyroid carcinoma (MTC) or those with multiple endocrine neoplasia type 2 (MEN 2) should not take Mounjaro.

Understanding Trulicity

Trulicity belongs to the GLP-1 receptor agonists class of medications. It works by stimulating insulin release when blood sugar levels are high, reducing the release of the hormone that raises blood sugar, and slowing down digestion. This helps prevent blood sugar spikes after meals while also promoting a feeling of fullness.

Trulicity is an effective option for improving long-term blood sugar control and supporting moderate weight loss.

Uses

Like Mounjaro, Trulicity is approved to improve blood sugar control in adults with type 2 diabetes in addition to healthy eating and exercise. Additionally, it can help reduce major adverse cardiovascular events (MACE) such as heart attack and stroke in patients living with type 2 diabetes, established cardiovascular disease, or multiple cardiovascular risk factors.

One of its key advantages is its effectiveness at lowering hemoglobin A1C, helping patients achieve better long-term blood sugar control. In addition to its effects on blood sugar, its active ingredient can support moderate weight loss, which can be beneficial for managing type 2 diabetes and improving overall health.

Side Effects

The most commonly reported side effects of Trulicity include:

  • Diarrhea
  • Low blood sugar
  • Nausea
  • Vomiting

Serious side effects may include:

Trulicity should not be taken by those with a personal or family history of MTC or in those with MEN 2 because there may be an increased risk of developing thyroid tumors.

Summary

Mounjaro’s dual mechanism of action may provide stronger effects on blood sugar control and weight loss compared to Trulicity, which focuses solely on GLP-1. However, Trulicity has been available for longer and offers proven effectiveness while also minimizing cardiovascular risks. Switching between Trulicity and Mounjaro may be an option for people with type 2 diabetes depending on their individual treatment needs and goals.

Cost, availability, and tolerability should be considered when working with your healthcare provider to decide if Mounjaro or Trulicity is best for you.

Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
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  4. Frias JP, Nauck MA, Van J, et al. Efficacy and safety of LY3298176, a novel dual GIP and GLP-1 receptor agonist, in patients with type 2 diabetes: a randomised, placebo-controlled and active comparator-controlled phase 2 trialLancet. 2018;392:2180–2193. doi:10.1016/S0140-6736(18)32260-8

  5. MedlinePlus. Tirzepatide injection.

  6. Rosenstock J, Wysham C, Frías JP, et al. Efficacy and safety of a novel dual GIP and GLP-1 receptor agonist tirzepatide in patients with type 2 diabetes (SURPASS-1): a double-blind, randomised, phase 3 trial. The Lancet. 2021;398(10295):143-55. doi:10.1016/S0140-6736(21)01324-6

  7. Frías JP, Davies MJ, Rosenstock J, et al. Tirzepatide versus semaglutide once weekly in patients with type 2 diabetes. New England Journal of Medicine. 2021;385(6):503-515. doi:10.1056/NEJMoa2107519

  8. Gerstein HC, Colhoun HM, Dagenais GR, et al. Dulaglutide and cardiovascular outcomes in type 2 diabetes (REWIND): a double-blind, randomised placebo-controlled trial. The Lancet. 2019;394(10193):121-130. doi:10.1016/S0140-6736(19)31149-3

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By T’Keyah Bazin, PharmD

T’Keyah Bazin, PharmD, is a clinical pharmacist and experienced health content writer. She received her Doctor of Pharmacy degree from the University of Mississippi School of Pharmacy.

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