What Is Mounjaro? Mounjaro's Effects, Side Effects, and Usage
Weight Loss Program
What Is Mounjaro? Mounjaro's Effects, Side Effects, and Usage
Mounjaro (Generic Name: Tirzepatide, also known as Mengjianle)
EDD
November 26, 2025
5 minutes
Share
Mounjaro (generic name: Tirzepatide, also known as Mengjianle) is a major breakthrough in the field of weight management in recent years. Mounjaro was initially approved by the U.S. FDA for the treatment of type 2 diabetes, but thanks to its outstanding weight-loss results, it has quickly become a popular new choice for people seeking long-term weight management.This article will provide a comprehensive analysis of Mounjaro’s effects, usage, and potential side effects to help you safely embark on your weight management journey!
(Image alt text: Mounjaro Hong Kong—Manjianle—Mengjianle)
Mounjaro (Tirzepatide) is an innovative prescription injectable medication developed by Eli Lilly.Unlike traditional weight management pens, Mounjaro is currently the world’s only “dual agonist” capable of simultaneously activating the receptors for both GIP (glucose-dependent insulinotropic polypeptide) and GLP-1 (glucagon-like peptide-1). These two gut hormones work together to effectively deliver more significant weight loss and blood sugar control. Mounjaro is a pre-filled pen that requires one injection per week.
Mounjaro has demonstrated remarkable efficacy in numerous large-scale clinical studies, with particularly impressive results in weight loss. According to the SURMOUNT-1 clinical trial, participants using Mounjaro achieved an average weight loss of 15%–21% after 72 weeks, and more than 40% of patients lost over 20% of their body weight.
At the same time, according to the results of the SURPASS series of clinical trials, patients with type 2 diabetes experienced an average reduction in their glycated hemoglobin (HbA1c) levels of approximately 1.5%–2.6% after taking tirzepatide, indicating that Mounjaro has significant glucose-lowering capabilities and may offer potential protection for cardiovascular health.
(Image alt text: How to Use Mounjaro—How to Use Manjianle—Mengjianle)
1. Mounjaro Dosage
To minimize the side effects of Mounjaro, treatment typically begins with a low dose, which is gradually increased:
Treatment Phases
Recommended Weekly Dose
Description
Weeks 1–4
2.5 milligrams
Helps the body adjust to the medication and alleviates gastrointestinal discomfort.
Week 5 and beyond
5 milligrams
The medication has begun to produce consistent weight loss and metabolic improvements
Further increase
7.5 mg / 10 mg / 12.5 mg / 15 mg
If additional control of blood glucose or weight is needed, the dose may be increased by 2.5 mg at a time after continuing the current dose for at least 4 weeks, up to a maximum of 15 mg per week.
Please note: All dosage adjustments must be evaluated and prescribed by a doctor; never increase the dose or change the method of use on your own.
2. Mounjaro Injection Schedule
Frequency of administration: Once a week; may be administered at any time of day.
Best Practice: It is recommended to schedule injections on the same day each week, if possible, to maintain stable drug levels.
3. What to Do If You Forget to Take Mounjaro
If you forget to get a shot but remember within 4 days (96 hours) of missing the dose, please get the missed dose as soon as possible. If more than 4 days have passed, skip that dose and get the next one at the scheduled time.
Preparation: Wash your hands with soap, check the dosage and expiration date of the medication, and inspect the injection pen; the solution should be colorless or slightly yellow and clear.
Site Selection: Choose an area of subcutaneous fat on the abdomen (approximately 5 centimeters outside the navel), the thigh, or the outer side of the upper arm. Rotate the injection site with each injection.
Adjust the dose: Turn the dose dial and confirm that the display shows the correct dose (e.g., 1 for 2.5 mg per week). Attach a new needle and tighten it securely, then remove the needle cap.
Cleaning and Injection: Clean the injection site with an alcohol swab. Turn the dose dial to the correct dose, press the tip of the pen firmly against the skin, press the injection button, and hold it down until you hear a “click,” which indicates that the injection has begun.
Completing the Injection: Once the medication has been fully injected, you will hear a second “click,” indicating that the injection is complete. Remove the pen and dispose of the used needle or pen properly in a designated sharps container.
(Image caption: Mounjaro Hong Kong—Who Should Take Mounjaro—Who Should Not Take Mounjaro)
Who Should Take Mounjaro?
People with "three highs": Individuals with high blood pressure, high blood sugar, or high blood lipids who need to improve their metabolic health.
People with prediabetes or type 2 diabetes: Those who need to better control their blood sugar levels, or who wish to manage their weight or lose weight while controlling their blood sugar.
Obese individuals: Those who are moderately obese (BMI > 27) and have associated health problems.
Obese individuals: Adults who are obese (BMI > 30)—that is, those who meet the criteria for obesity and need to manage their weight.
People seeking non-surgical weight loss options: Individuals who wish to lose weight through medication but are unwilling or unsuitable for surgery.
People for Whom Mounjaro Is Not Suitable
Individuals who are allergic to the active ingredients in Mounjaro.
Individuals with severe gastrointestinal diseases, medullary thyroid carcinoma (MTC), or a history of such conditions, or those with severe renal or hepatic impairment.
While taking Mounjaro, you may experience side effects of varying severity. Understanding the common side effects of Mounjaro can help you stay alert and respond promptly. In addition, please closely monitor any changes in your body while taking this medication. If you experience severe abdominal pain, persistent vomiting, or other unusual symptoms, stop taking the medication immediately and seek medical attention.
Common side effects of Mounjaro include nausea, diarrhea, loss of appetite, vomiting, constipation, indigestion, and abdominal pain. These reactions are mostly mild to moderate and usually subside gradually as the body adjusts to the medication.
Uncommon side effects of Mounjaro: For example, pancreatitis (which may cause severe abdominal pain), gallbladder problems, kidney dysfunction, and even a potential risk of thyroid tumors.
Please store unused Manjianle injection pens in a refrigerator at 2°C to 8°C (never in the freezer). As long as the injection pen is kept within this temperature range, the unused medication remains usable until the expiration date printed on the label. If the injection pen is accidentally frozen, it must be discarded and must not be used again. It should also be stored in its original packaging to protect it from light.
2. Used Manjianle insulin pen
After completing the injection, store the used Manjianle injection pen at room temperature below 30°C, away from high temperatures.Please note that the pen must be discarded within 30 days of its first use, regardless of whether the medication has been fully used. If you have completed four weekly doses, you should also replace the pen with a new one promptly. Additionally, be sure to keep the pen and needles out of the sight and reach of children to ensure safety.
Mounjaro is a prescription medication and must be purchased with a prescription, under the guidance of a pharmacist, at a licensed pharmacy or clinic. Never purchase weight-loss pens of unknown origin from unofficial sources, as this could harm your health or result in the purchase of counterfeit medication.
If you're looking for a convenient and discreet way to purchase medication, consider the EDD Mall online pharmacy platform. As one of Hong Kong's largest online platforms for follow-up consultations and medication delivery, EDD Mall partners with licensed pharmaceutical manufacturers and distributors to ensure that medications are sourced safely and are of guaranteed quality.
The cost of Mounjaro treatment varies depending on the dosage (e.g., 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, 15 mg), the healthcare provider, and the region. We recommend consulting your doctor or a licensed pharmacy directly for the most up-to-date Mounjaro pricing and selecting the treatment plan that best suits your needs based on your doctor’s advice.
Is it illegal to purchase the Japanese version of Mounjaro or Wegovy (Slim Pen) in Hong Kong?
Yes. In Hong Kong, all medications containing telapreotide (Mounjaro) or semaglutide (Wegovy) are classified as poisons and prescription drugs under Part 1 of the Pharmacy and Poisons Ordinance and may only be legally purchased and used with a prescription from a Hong Kong-registered physician and under the supervision of a registered pharmacist.Purchasing unregistered parallel-imported products from Japan is illegal and punishable by a maximum fine of 100,000 Hong Kong dollars and up to two years’ imprisonment.
What are the main risks of buying Japanese slimming pens online?
The main risks include: 1. A break in the cold chain leading to the deterioration or ineffectiveness of medications; 2. Products not registered with the Hong Kong Department of Health, meaning their quality cannot be guaranteed; 3. Potential violations of Hong Kong law, resulting in enforcement action by Customs or the Department of Health; 4. High risk of side effects due to the lack of medical supervision.
What is the difference between the Japanese version of the Slim Pen and the official Hong Kong version?
Most Japanese versions are parallel imports; their packaging is in Japanese, and the dosage is designed for single-use, but the cold chain is often disrupted during shipping. In contrast, Hong Kong’s officially imported products feature a registration number from the Department of Health, a fully maintained cold chain, a doctor’s prescription, and post-sale follow-up, ensuring greater safety and legality.
Does the Shou Shou Pen need to be refrigerated? Why?
Yes. The active ingredients in Mounjaro and Wegovy are protein-based peptide medications that must be stored at 2°C to 8°C. If the cold chain is broken, the medications will rapidly denature, rendering them ineffective for weight loss and potentially causing health problems.
How can I use Mounjaro or Wegovy safely and legally for weight loss?
A Hong Kong-registered doctor must first assess your BMI and physical condition and issue a prescription before you can purchase genuine Hong Kong-sourced products from a licensed medical institution. EDD Health provides doctor prescriptions, a genuine product guarantee, and cold-chain delivery services.
Will the Hong Kong Customs Service step up its crackdown on parallel imports of "slimming pens" in 2026?
Yes. In 2026, there have been several operations, including the arrest of online sellers, the seizure of mail packages worth nearly one million, and raids on pharmacies, indicating a significant escalation in law enforcement efforts.
