Mounjaro 2.5 mg (tirzepatide) injection is a prescription medication containing the active ingredient tirzepatide, a dual glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptor agonist.
It is indicated as an adjunct to diet and exercise to improve glycemic control in adults and pediatric patients 10 years of age and older with type 2 diabetes mellitus. The 2.5 mg strength is the recommended starting (initiation) dose and is not intended for glycemic control itself.
Key details
• Form: Clear, colorless to slightly yellow solution for subcutaneous injection, supplied in single-dose pens or vials (or multi-dose KwikPen presentations in some markets). Concentration is typically 2.5 mg per 0.5 mL (or equivalent dosing volume depending on the device).
• Administration: Injected once weekly under the skin (abdomen, thigh, or upper arm), at any time of day, with or without meals. Rotate injection sites. The dose can be taken on the same day each week.
• Dosing schedule: Start at 2.5 mg once weekly for 4 weeks to help the body adjust and reduce the risk of gastrointestinal side effects. After 4 weeks, the dose is typically increased to 5 mg once weekly, with further increases in 2.5 mg increments (after at least 4 weeks on the current dose) if additional glycemic control is needed, up to a maximum of 15 mg weekly in adults (or 10 mg in pediatric patients 10+).
Mounjaro works by helping the body release more insulin when blood sugar is high, reducing glucagon levels, slowing gastric emptying, and influencing appetite regulation. It is manufactured by Eli Lilly.
Important: This is a prescription-only medicine. It is not for type 1 diabetes or diabetic ketoacidosis. It carries a boxed warning regarding the risk of thyroid C-cell tumors (based on rodent studies; human relevance is unknown) and is contraindicated in patients with a personal or family history of medullary thyroid carcinoma or Multiple Endocrine Neoplasia syndrome type 2, or known serious hypersensitivity to tirzepatide or its excipients. Common side effects include gastrointestinal symptoms such as nausea, diarrhea, decreased appetite, vomiting, constipation, and abdominal pain, which are often more noticeable during initiation or dose increases.
Always use only as prescribed by a healthcare professional. Consult the full prescribing information, patient information leaflet, or your doctor/pharmacist for complete details, contraindications, warnings, and proper use






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