Mounjaro
tirzepatide · dual GIP/GLP-1 receptor agonist
Mounjaro is once-weekly tirzepatide, FDA-approved for type 2 diabetes only. It activates two gut-hormone receptors, GIP and GLP-1, rather than one, which drives stronger A1C reduction than single-agonist GLP-1s. Doses step up from 2.5 mg to a maximum of 15 mg in 2.5 mg increments. Common side effects are gastrointestinal, and a boxed warning covers thyroid C-cell tumor risk. List price is roughly $1,080/mo, with LillyDirect self-pay at $499/mo for all doses and free medication available through Lilly Cares for qualifying uninsured patients.
GIP/GLP-1 RA
Once weekly
11–13%
$1,080/mo
Overview
Mounjaro is the brand name for tirzepatide, a once-weekly injectable from Eli Lilly. Unlike Ozempic or Wegovy, it activates two receptors, GIP and GLP-1, which is why its glycemic and weight effects are larger in trials. It is FDA-approved as an adjunct to diet and exercise to improve glycemic control in adults with type 2 diabetes. It is not approved for weight loss; the same molecule is sold as Zepbound with a chronic weight management indication.
How Mounjaro works
Curbs appetite
Slows digestion
Steadies blood sugar
What it's used for
- Improve blood sugar (A1C) in adults with type 2 diabetes
- Off-label weight management under clinician guidance
- Not FDA-approved for weight loss; Zepbound is the tirzepatide product carrying that indication
Effectiveness
In the SURPASS trials, Mounjaro lowered A1C by roughly 1.9 to 2.6 points depending on dose. In SURPASS-2, the head-to-head study against semaglutide 1 mg, tirzepatide won on both A1C reduction and weight loss at all three doses tested. Mean weight loss in those type 2 diabetes populations ran about 11% to 13% at the higher doses. Weight loss tends to be smaller in people with type 2 diabetes than in the non-diabetic populations studied for Zepbound. Individual results vary.
Dosing schedule
Dose increases happen in 2.5 mg increments after at least 4 weeks at the current dose. Injection day can be changed as long as at least 3 days separate two doses.
Side effects & Safety
Common side effects
- Nausea
- Vomiting
- Diarrhea
- Constipation
- Abdominal pain
- Decreased appetite
Serious risks & warnings
- Thyroid C-cell tumor risk (boxed warning)
- Pancreatitis
- Gallbladder problems
- Low blood sugar with insulin/sulfonylureas
- Kidney injury from dehydration
- Severe gastrointestinal reactions
- Pulmonary aspiration during general anesthesia or deep sedation
- Diabetic retinopathy changes
Do not use with a personal or family history of medullary thyroid carcinoma or MEN 2.
Cost & savings
List price is about $1,080/mo without insurance. Most people pay less through one of these routes:
Through insurance
Varies
Telehealth cash-pay
$99/mo
Patient assistance
$0
Mounjaro self-pay through LillyDirect is $499 per month for all doses. Self-pay pricing cannot be combined with commercial insurance, Medicare, or Medicaid. Prices verified August 2026.
Compare with other GLP-1s
Frequently asked questions
Is Mounjaro the same as Zepbound?
Same active ingredient, tirzepatide, from the same manufacturer, at the same dose strengths. The difference is the FDA-approved indication on the label: Mounjaro for type 2 diabetes, Zepbound for chronic weight management and obstructive sleep apnea. That difference drives insurance coverage and price.
Can I get Mounjaro for weight loss?
Not on-label. If weight loss is the goal and you do not have type 2 diabetes, Zepbound is the appropriate product and is usually cheaper for cash-paying patients. A clinician determines which applies to you.
Is Mounjaro more effective than Ozempic?
In SURPASS-2, the only head-to-head trial, tirzepatide beat semaglutide 1 mg on both A1C reduction and weight loss at all three doses tested. That comparison used the 1 mg semaglutide dose, not the 2 mg maximum.
How long does it take Mounjaro to work?
Blood sugar improvements often appear within the first few weeks. Weight changes build gradually as the dose escalates over several months.
What if I miss a dose of Mounjaro?
If it has been 4 days or less since the missed dose, take it as soon as you remember. If more than 4 days have passed, skip it and resume your regular schedule. Do not take two doses to make up for one.
Educational only, not medical advice. Mounjaro is a prescription medication; a licensed clinician determines if it's appropriate. Effectiveness figures are trial averages (SURPASS); results vary. Mounjaro is not FDA-approved for weight loss. Pricing verified August 2026 and subject to change. *Starting price for doctor-guided care; medication cost is separate.