Skip to content
GLP-1 Decoder

Mounjaro Butt: How Common, How Long It Lasts, What Helps

Butt changes do not appear on the Mounjaro label as a side effect. What people mean by it: a flatter or saggier buttock area after fast weight loss.

In the label
Not listed
Most common in the label
Nausea 18%

Mounjaro overview

Time it remains in your body
100%50%25%0%05 d10 d15 d20 d25 d50%25%12.5%time after the dose

Its half-life is about 5 days. At 5 d, half is gone. Once five half-lives have passed (25 d), about 3% remains.

Amount of weight lost in the main trial
Mounjaro (SURPASS-1)7.8 kgPlacebo1 kg

In the 40-week SURPASS-1 trial for type 2 diabetes, participants lost 7.8 kg, compared with 1 kg on placebo.

Costs as time goes on
2026$1,112.16$0List priceSelf-pay

In US dollars, monthly prices include the list price and self-pay offers. Each comes from the maker's price page.

Sources: FDA label (DailyMed), healthsystemtracker.org, pricinginfo.lilly.com.

What the Mounjaro label lists instead

Butt changes do not appear on the Mounjaro label. The label lists these five side effects most often.

Table 1 shows Adverse Reactions in Pool of Placebo-Controlled Trials Reported in ≥5% of MOUNJARO-treated Adult Patients with Type 2 Diabetes Mellitus
Side effectPlaceboMounjaro 5 mgMounjaro 10 mgMounjaro 15 mgMore than placebo, 15 mg
Nausea4%12%15%18%+14 points
Diarrhea9%12%13%17%+8 points
Decreased Appetite1%5%10%11%+10 points
Vomiting2%5%5%9%+7 points
Dyspepsia3%8%8%5%+2 points

Source: Mounjaro label (DailyMed).

Source: FDA label (DailyMed).