Mounjaro (tirzepatide) is a once-weekly prescription injection approved for the treatment of type 2 diabetes and for chronic weight management in adults with obesity or who are overweight with a weight-related health condition. It works by mimicking two natural gut hormones, GLP-1 and GIP, to help control blood sugar and reduce appetite.
Key Information
Active Ingredient: Tirzepatide.
Administration: A self-administered subcutaneous (under the skin) injection using a pre-filled pen, once per week.
Indications:
Improving blood sugar (glycemic) control in adults with type 2 diabetes, alongside diet and exercise.
Weight loss and weight management in adults with a BMI of 30 kg/m² or greater (obesity), or a BMI of 27 kg/m² to 30 kg/m² (overweight) with at least one weight-related condition, such as high blood pressure or high cholesterol. (For weight management, it is also available under the brand name Zepbound in some countries).
Dosage: Treatment typically starts at a low dose (2.5 mg once weekly) and is gradually increased by a healthcare provider every four weeks to minimize side effects, up to a maximum dose of 15 mg weekly.
Injection Sites: The injection can be given in the abdomen, thigh, or upper arm. It is important to rotate the injection site each week.
How to Use the Mounjaro Injection Pen
Mounjaro comes in an easy-to-use, pre-filled pen. The general steps are:
Wash your hands with soap and water.
Prepare the pen and check that the liquid is clear and colorless to slightly yellow, and the pen is not damaged or expired.
Attach a new needle (for KwikPens, the needle is often pre-attached or the process is simpler).
Select your injection site: abdomen (at least 2 inches from the belly button), thigh, or upper arm.
Inject the medication as directed by your healthcare provider and the pen's instructions. A click often indicates the injection has started, and a second click or the dose counter returning to '0' indicates completion.
Dispose of the used needle and pen in a a special sharps container.
Always follow the detailed instructions provided with the medication or by your doctor.
Potential Side Effects and Warnings
The most common side effects are gastrointestinal and typically lessen over time.
Common Side Effects: Nausea, diarrhea, decreased appetite, vomiting, constipation, indigestion, and abdominal pain.
Serious Warnings/Risks:
Thyroid C-cell tumors: Mounjaro carries a boxed warning due to the risk of thyroid C-cell tumors found in animal studies. It should not be used if you or a family member have a history of medullary thyroid carcinoma (MTC) or Multiple Endocrine Neoplasia syndrome type 2 (MEN 2).
Pancreatitis: Inflammation of the pancreas (severe stomach pain, vomiting) has been reported and requires immediate medical attention.
Hypoglycemia (low blood sugar): The risk increases if Mounjaro is used with other diabetes medications like insulin or sulfonylureas.
Other risks: Gallbladder problems, severe stomach issues, and allergic reactions are also possible.
Consult a healthcare professional to determine if Mounjaro is appropriate for your health needs and to understand proper usage and monitoring.

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