Tirzepatide: ask which product and why.

What are the approved uses?

As of September 2026, Mounjaro had U.S. approval for type 2 diabetes. For adults with that diabetes at high risk, approval also covered reducing heart attacks, strokes and deaths from heart or blood-vessel disease.

Zepbound’s adult approvals covered long-term weight management and moderate to severe obstructive sleep apnea in people with obesity.

With obstructive sleep apnea, breathing becomes blocked again and again while the person sleeps. It is a specific condition, not simply poor sleep.

The weight-management use includes food and activity changes.

What did the weight trial find?

Across tirzepatide groups in SURMOUNT-1, average weight loss after 72 weeks was about 15% to 21%. Participants were adults without diabetes.

People given an injection with no active medicine lost about 3% over the same 72 weeks. All groups had regular visits and advice about food and physical activity. Lilly helped pay for the trial.

Those are group averages. Ask about the care plan and how it will be reviewed, rather than expecting a particular percentage.

Which medicine warnings need attention?

The official Zepbound instructions report that about 25% to 29% of people felt sick to their stomach in its weight trials. Among people given an injection with no active medicine, 8% felt sick.

Its boxed warning is the strongest warning in the medicine instructions. It describes thyroid tumours in rats and says the effect in humans is unknown.

Medullary thyroid cancer is rare and affects the thyroid. Under the instructions, use is ruled out if you have had this cancer yourself or someone in your family has had it.

They also rule out use if you have MEN 2, a rare illness passed down in families. Ask about those exact illness names when checking family health records.

A past serious allergy to any ingredient in the product, including tirzepatide, also rules out use under the instructions.

The instructions warn that tirzepatide can reduce the effect of birth-control pills during certain treatment changes.

Prescribers are told to recommend birth control without pills or an additional barrier method during the first 4 weeks of treatment and the 4 weeks following every dose increase.

A barrier method is birth control that blocks sperm. Ask which method fits your situation.

Ask the prescriber to explain the birth-control warnings for your situation. Discuss pregnancy plans and upcoming surgery too.