Tirzepatide Peptide

Tirzepatide is an FDA-approved dual GIP and GLP-1 receptor agonist given as a once-weekly subcutaneous injection, marketed as Mounjaro for type 2 diabetes and Zepbound for chronic weight management and for obstructive sleep apnea in adults with obesity.

SURMOUNT-1 reported mean weight reduction of about 21% at 72 weeks on the highest dose in adults with obesity and without diabetes, versus about 3% on placebo. Results vary by dose and by whether type 2 diabetes is present.

Approved labeling starts at 2.5 mg once weekly for four weeks as a tolerability step, then increases in 2.5 mg increments no more often than every four weeks, up to a maximum of 15 mg weekly. Titration is set by the prescriber.

It also activates the GIP receptor. GIP agonism is thought to add to appetite regulation and improve insulin sensitivity signaling, and it is the mechanistic explanation usually given for the larger weight and HbA1c effects seen versus semaglutide in SURPASS-2 and SURMOUNT-5.

Gastrointestinal effects dominate — nausea, diarrhea, vomiting, constipation, and reduced appetite — and are typically dose-limiting. Labeling carries a boxed warning for thyroid C-cell tumors observed in rodents; gallbladder events and pancreatitis are also listed.

Compounded tirzepatide is not FDA-evaluated for safety, efficacy, or quality. The FDA has issued warnings about the compounded incretin market, including unapproved salt forms and dosing errors, so it is not equivalent to the approved product.

There is no clinical evidence supporting combinations of tirzepatide with research peptides, and stacking is not studied in trials. Any combination question belongs with a licensed prescriber who can review the full medication list.