What Are the Side Effects of Mounjaro?

Posted on January 16, 2024 by Sally-Anne Turner

Mounjaro, also known as tirzepatide, is an innovative prescription medication that has shown great potential in promoting weight loss in clinical trials. Due to rising levels of obesity and therefore increasing need for treatments, many people are rushing to try game-changing medications like Mounjaro to solve their problems. With over a quarter of UK adults currently living with obesity, the demand for effective medical interventions has never been greater, and Mounjaro represents one of the most significant advances in weight management medication in recent years.

But like any medication, Mounjaro may have side effects that users should be aware of. Here at Bodyline, we are at the forefront of the latest obesity medical treatment news and believe it is vital to ensure those interested are given all the information. That's why we'll be exploring the possible side effects of Mounjaro and provide important information for individuals considering this medication as part of their weight loss journey. Understanding these potential effects before starting treatment allows you to make an informed decision and prepare yourself for what to expect during your weight loss programme.

At Bodyline Medical Wellness Clinics, we've supported over 100,000 patients across the UK with their weight loss goals over the past 18 years. Our CQC-regulated clinics in Birkenhead, Liverpool, Manchester, Warrington, St Helens, Stockport, and Stoke-on-Trent provide expert guidance on weight loss medications, including Mounjaro. We also offer convenient online consultations for patients throughout England, Scotland, Wales, and Northern Ireland, ensuring that wherever you are in the UK, you can access safe, supported medical weight loss treatment.

Understanding Mounjaro

Mounjaro was originally created by pharmaceutical company Eli Lilly for the treatment of type-2 diabete; however,r clinical trials have shown incredible weight loss results in over 85% of users. It is an injectable therapy administered once weekly containing the active ingredient tirzepatide. The medication comes in a pre-filled pen that makes self-administration straightforward and convenient, with patients typically injecting into their abdomen, thigh, or upper arm once per week on the same day each week.

Mounjaro has two incretin hormones, and it is classified as a 'dual-agonist'. This double agonist approach seems to cause people who use Mounjaro weekly injections to lose even more weight than those who use a single-agonist medication. These receptors stimulate hormones that control blood sugar levels and reduce appetite, triggering weight loss. The receptors are known as glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP). This dual mechanism of action is what sets Mounjaro apart from earlier weight loss medications and contributes to its impressive clinical results.

The way Mounjaro works in your body is quite sophisticated. GLP-1 is a hormone naturally produced in your intestines after you eat, and it performs several important functions, including slowing down digestion, reducing appetite, and helping regulate blood sugar levels. GIP is another gut hormone that works alongside GLP-1 to enhance insulin secretion and improve the way your body processes nutrients. By mimicking both of these natural hormones, Mounjaro provides a comprehensive approach to weight management that addresses multiple aspects of metabolism and appetite control simultaneously.

In the UK, as of November 2023 Mounjaro has been approved by the Medicines and Healthcare products Regulatory Agency (MHRA) to be prescribed as a weight loss management treatment. It will be available to those who have a BMI of over 30 and those with a BMI of over 27 but suffer with weight-related health problems like prediabetes or high blood pressure. This approval followed extensive clinical trials demonstrating both the efficacy and safety profile of the medication when used under proper medical supervision.

Bodyline is at the forefront of providing the latest obesity treatment options, as we continue to offer safe, effective, and sustainable medical weight loss programmes. Our specialist weight loss nurses have undergone extensive training in prescribing and monitoring weight loss medications, and we take a holistic approach that combines medication with nutritional guidance, lifestyle support, and regular clinical monitoring. This comprehensive approach ensures that you not only lose weight effectively but also develop the habits and knowledge necessary to maintain your results long-term.

The dosing schedule for Mounjaro is carefully structured to minimise side effects whilst maximising effectiveness. Treatment typically begins with a lower dose that gradually increases over several weeks, allowing your body time to adjust to the medication. This titration approach is important for reducing the likelihood and severity of side effects, particularly the gastrointestinal symptoms that are most commonly reported during the initial weeks of treatment.

Contact Bodyline today to find out more about our safe and effective weight loss programmes and range of treatment options.

If you're considering Mounjaro as part of your weight loss journey, speaking with one of our experienced weight loss specialists is the first step. Call us on 0800 995 6036 or complete our online contact form to book your initial consultation. During this appointment, we'll assess your medical history, discuss your weight loss goals, and determine whether Mounjaro or another treatment option from our range is most suitable for your individual circumstances.

Common Side Effects

Like other single hormone GLP-1 receptor agonists, Mounjaro can cause gastrointestinal side effects. Ensuring safety while using weight loss medications should be prioritised, which is why it is vital to use it within a fully clinically supported and holistic medical weight loss programme with clinics like Bodyline. The gastrointestinal effects occur because Mounjaro slows down the rate at which your stomach empties, which is actually one of the mechanisms that helps you feel fuller for longer and reduces your overall calorie intake.

Our experienced and qualified healthcare professionals can monitor side effects and alter prescriptions and dosages where needed, putting emphasis on safety and wellness all throughout the weight loss journey. Though these side effects are generally mild and tend to subside over time, some people can have adverse experiences. At Bodyline, we provide ongoing support throughout your treatment, with regular check-ins to assess how you're responding to the medication and make any necessary adjustments to optimise your experience and results.

The most commonly reported gastrointestinal side effects include:

1. Nausea: Some users may experience feelings of nausea, which may range from mild to moderate. This side effect is usually temporary and fades as the body adjusts to the medication. Nausea is most common during the first few weeks of treatment or when your dose is increased. To manage nausea, try eating smaller, more frequent meals rather than large portions, avoid lying down immediately after eating, and stay well-hydrated throughout the day. Many patients find that ginger tea or ginger supplements can help alleviate nausea naturally. If nausea becomes severe or persistent, contact your Bodyline nurse, who may recommend adjusting your dosage or timing of administration.
2. Constipation: Mounjaro can occasionally cause constipation. It is important to maintain hydration and consume a diet rich in fibre to help alleviate this side effect. Due to the medications' impact on slowing digestion, it is also vital to ensure you are adjusting your daily food intake, as high-sugar food can worsen the impact of this side effect. Aim to drink at least two litres of water daily, and include plenty of vegetables, fruits, whole grains, and legumes in your diet. Regular physical activity, even gentle walking, can also help stimulate bowel movements and reduce constipation. Our nutritional guidance at Bodyline includes specific recommendations for maintaining healthy digestion whilst taking Mounjaro.
3. Diarrhoea: In some cases, users may experience diarrhoea while taking Mounjaro. This side effect is usually temporary and should improve with time, but ensure you drink plenty of water as diarrhoea can be dehydrating. If diarrhoea persists for more than a few days or becomes severe, it's important to contact your healthcare provider as you may need additional support or a temporary adjustment to your treatment plan. Avoiding fatty, spicy, or heavily processed foods can help reduce the likelihood of experiencing diarrhoea whilst your body adjusts to the medication.
4. Heartburn: Heartburn or acid reflux may occur as a result of taking Mounjaro. It is recommended to avoid spicy and acidic foods, eat smaller meals, and maintain an upright posture after eating to minimise this side effect. Elevating the head of your bed slightly can help prevent nighttime reflux, and avoiding eating within three hours of bedtime gives your stomach time to empty before you lie down. If heartburn becomes problematic, over-the-counter antacids may provide relief, though you should discuss this with your Bodyline nurse to ensure there are no interactions with your treatment plan.
5. Vomiting: Though less common than nausea, some patients may experience vomiting, particularly in the early stages of treatment. This typically occurs if you eat too much or too quickly, which is why adjusting your eating habits is crucial when starting Mounjaro. Taking your time with meals, chewing thoroughly, and stopping when you feel comfortably satisfied rather than completely full can help prevent vomiting episodes.
6. Abdominal discomfort or bloating: Some patients report feelings of fullness, bloating, or general abdominal discomfort. This is related to the slowed gastric emptying effect of the medication. Eating smaller portions, avoiding carbonated beverages, and choosing easily digestible foods can help minimise these symptoms. The discomfort typically improves as your body adapts to the medication over the first few weeks of treatment.
7. Contraceptive efficacy: Obese or overweight women who are taking the oral contraceptive pill are advised to use barrier methods like condoms to prevent pregnancy, as the MHRA warns that Mounjaro may affect how well the contraceptive pill works in these patients. This is particularly important during the first four weeks after starting Mounjaro or after any dose increase. The slowed gastric emptying can affect the absorption of oral medications, including contraceptive pills. Women of childbearing age should discuss contraception options with their Bodyline nurse before starting treatment to ensure they have appropriate protection in place.

There are no foods to avoid while taking Mounjaro or WeGovy, but it is advisable to eat slower, consume smaller portions, and limit ultra-processed foods that are high in sugar and saturated fats in order to see the best outcomes and limit side effects. At Bodyline, our nutrition guidance helps you understand which foods work best with your medication, how to structure your meals to minimise side effects, and how to ensure you're getting adequate nutrition even whilst eating less.

It's worth noting that the severity and duration of side effects can vary significantly from person to person. Some patients experience very few side effects and tolerate the medication extremely well from the start, whilst others may need more time and support to adjust. This is why the gradual dose escalation schedule is so important – it gives your body time to adapt to the medication's effects and helps minimise the intensity of side effects.

Most gastrointestinal side effects are most pronounced during the first few weeks after starting Mounjaro or after a dose increase, and they typically improve significantly within four to six weeks as your body adjusts. By the time you reach your maintenance dose, many patients find that side effects have resolved completely or are minimal enough that they don't interfere with daily life. The weight loss benefits, meanwhile, continue throughout your treatment.

Rare Side Effects

While rare, some individuals may experience more severe side effects while taking Mounjaro. These side effects should be promptly reported to a healthcare professional. Rare side effects may include:

Hypoglycaemia: Mounjaro may lower blood sugar levels, leading to hypoglycaemia (low blood sugar). Symptoms of hypoglycaemia include dizziness, confusion, shakiness, sweating, rapid heartbeat, irritability, and in severe cases, loss of consciousness. It is important to be part of a fully supported medical weight loss programme to monitor your health and alter your treatment as and when you need. This risk is higher in patients who are also taking other medications for diabetes, particularly insulin or sulfonylureas. If you have diabetes, your Bodyline nurse will work closely with you to adjust your diabetes medications appropriately as you lose weight and your blood sugar control improves.

If you experience symptoms of low blood sugar, it's important to treat it immediately by consuming a fast-acting carbohydrate such as glucose tablets, fruit juice, or regular soft drinks. Your Bodyline care team will provide you with detailed guidance on recognising and managing hypoglycaemia if you're at risk. Regular blood sugar monitoring may be recommended, particularly in the early stages of treatment or if you have diabetes.

Pancreatitis: Although rare, Mounjaro has been associated with cases of pancreatitis, which is inflammation of the pancreas. Symptoms may include severe abdominal pain that may radiate to your back, nausea, vomiting, fever, and rapid pulse. If these symptoms occur, immediate medical attention should be sought. Pancreatitis is a serious condition that requires urgent medical evaluation and treatment. If you've had pancreatitis in the past, this will be carefully considered during your initial assessment at Bodyline to determine whether Mounjaro is appropriate for you.

The risk of pancreatitis appears to be very low in clinical trials, but it's important to be aware of the symptoms so you can seek help promptly if needed. Patients with a history of pancreatitis, gallstones, or high triglyceride levels may have a slightly elevated risk and require additional monitoring or may be recommended alternative treatment options.

Thyroid Cancer: There have not been any human instances of thyroid cancer in the use of Mounjaro, but in trials there have been cases of it in animal trials. If you notice any lumps around your neck, hoarseness that doesn't go away, trouble breathing or swallowing, or persistent cough not related to a cold, it is vital you speak to your doctor as soon as possible. It's important to understand that the thyroid tumours observed in animal studies occurred at doses much higher than those used in humans, and there is currently no evidence that tirzepatide causes thyroid cancer in people.

However, as a precautionary measure, Mounjaro is not recommended for patients with a personal or family history of medullary thyroid carcinoma or Multiple Endocrine Neoplasia syndrome type 2. During your initial consultation at Bodyline, we'll take a thorough medical and family history to identify any factors that might affect your suitability for treatment.

Gallbladder problems: Rapid weight loss from any cause can increase the risk of gallstones, and some patients taking Mounjaro have experienced gallbladder-related issues including cholecystitis (inflammation of the gallbladder). Symptoms include severe pain in the upper right abdomen, pain that radiates to the right shoulder or back, nausea, vomiting, and fever. If you experience these symptoms, seek medical attention promptly. At Bodyline, we monitor your rate of weight loss to ensure it remains within safe parameters, which helps minimise the risk of gallbladder complications.

Kidney problems: There have been rare reports of kidney problems in patients taking GLP-1 medications, often related to dehydration from severe vomiting or diarrhoea. Staying well-hydrated is crucial, particularly if you experience gastrointestinal side effects. If you notice decreased urination, swelling in your legs or feet, or unusual fatigue, contact your healthcare provider. Patients with existing kidney problems require special consideration and closer monitoring when using Mounjaro.

Allergic reactions: Though uncommon, some people may experience allergic reactions to Mounjaro. Symptoms of a serious allergic reaction include difficulty breathing, swelling of the face, lips, tongue or throat, severe rash or itching, or feeling faint. If you experience any signs of a serious allergic reaction, seek emergency medical help immediately. Mild injection site reactions such as redness, itching, or swelling are more common and usually resolve on their own, but should still be mentioned to your Bodyline nurse.

Changes in vision: Some patients with diabetes may experience changes in their vision when starting Mounjaro, particularly if their blood sugar improves rapidly. This is usually temporary as your eyes adjust to better glucose control, but any vision changes should be reported to your healthcare provider. If you have diabetic retinopathy, your eye condition should be monitored by an ophthalmologist during treatment.

Safety Precautions

It is crucial to use Mounjaro under proper medical supervision. Weight loss medications, including Mounjaro, should only be prescribed when a clinical triage has been undertaken and part of a comprehensive weight loss program that includes a reduced-calorie diet, increased physical activity, and lifestyle modifications. Regular monitoring and follow-up with a healthcare professional are essential to ensure the proper use and safety of injectable therapies like Mounjaro.

At Bodyline, we follow strict prescribing protocols that align with MHRA guidelines and NICE recommendations. Before prescribing Mounjaro, we conduct a thorough medical assessment that includes reviewing your complete medical history, current medications, any allergies, and previous weight loss attempts. We check your blood pressure, calculate your BMI, and discuss your weight loss goals to ensure that Mounjaro is both appropriate and safe for you specifically.

If you are interested to find out more about Mounjaro or other more appropriate weight loss medications consult with Bodyline who can assess your specific situation and provide personalized recommendations. They will evaluate your medical history, current medications, and overall health to determine the suitability of Mounjaro for you. For some patients, alternative treatments such as Phentermine, Saxenda, or our natural weight loss supplements may be more appropriate based on individual circumstances.

Certain medical conditions require special consideration before starting Mounjaro. If you have a history of pancreatitis, thyroid problems, kidney disease, diabetic retinopathy, or eating disorders, these factors will be carefully evaluated during your consultation. Pregnant women or those planning to become pregnant should not use Mounjaro, as there is insufficient data on its safety during pregnancy. If you become pregnant whilst taking Mounjaro, you should stop the medication immediately and inform your healthcare provider.

Continued support across the bespoke weight loss programme will see side effects closely monitored, with advice and guidance from experienced nurses who can alter dosage, prescription, and offer lifestyle advice. This ensures that you can achieve the results you want safely, effectively, and sustainably. At Bodyline, your treatment plan is regularly reviewed and adjusted based on your progress, how well you're tolerating the medication, and any changes in your health or circumstances.

Our ongoing support includes regular weigh-ins to track your progress, nutritional counselling to help you make the most of your reduced appetite, exercise guidance tailored to your fitness level and any physical limitations, and continuous monitoring for side effects or complications. We're available to answer questions between appointments, and we encourage patients to contact us if they experience any concerning symptoms or have questions about their treatment.

At Bodyline, our dedicated weight loss specialists prioritize your well-being. We offer personalized weight loss programmes that include medical supervision and ongoing support. Contact us today at 0800 995 6036 or through our online contact form to learn more about Mounjaro and how it may be integrated into our comprehensive weight loss program. We have clinics throughout the Northwest of England, with locations in Warrington, Manchester, Liverpool, and other convenient locations, as well as online consultation options for patients across the UK.

Proper injection technique is also important for minimising side effects and ensuring the medication works effectively. During your initial appointment, our nurses will demonstrate how to administer your injection correctly, including how to prepare the pen, choose injection sites, and dispose of used needles safely. We'll provide you with detailed written instructions to take home, and you're always welcome to ask for a refresher demonstration if needed.

Rotating injection sites is important to prevent lipodystrophy (changes in fat tissue under the skin) and to ensure consistent absorption of the medication. We recommend using a different injection site each week, and avoiding injecting into areas that are tender, bruised, red, or hard. Most patients find the injection virtually painless when done correctly, and the once-weekly schedule is convenient and easy to fit into your routine.

Storage of your Mounjaro pens is another important consideration. The medication should be stored in the refrigerator before first use, though it can be kept at room temperature for up to 21 days after you begin using a pen. Never freeze Mounjaro, and protect it from direct sunlight and heat. Our pharmacy team will provide detailed storage instructions with your medication, and we're always available to answer questions about proper handling and storage.

If you miss a dose of Mounjaro, the guidance depends on how much time has passed since your scheduled injection day. If it's been less than four days, take the missed dose as soon as you remember. If it's been more than four days, skip the missed dose and take your next dose on your regularly scheduled day. Never take two doses at once to make up for a missed dose. If you're unsure what to do, contact your Bodyline nurse for guidance.

Drug interactions are another important safety consideration. Mounjaro can interact with certain medications, particularly other diabetes medications as mentioned earlier. It may also affect the absorption of oral medications due to its effect on gastric emptying. If you're taking any oral medications, particularly those with a narrow therapeutic window or those that need to be taken at specific times, discuss this with your Bodyline prescriber. You may need to adjust the timing of other medications or monitor more closely for effectiveness.

The decision to start Mounjaro should be made collaboratively between you and your healthcare provider, taking into account your individual health status, weight loss goals, previous treatment experiences, and personal preferences. At Bodyline, we believe in informed consent and shared decision-making. We'll provide you with all the information you need about the potential benefits and risks of Mounjaro, answer all your questions honestly, and support you in making the choice that's right for you.

For many patients, the benefits of Mounjaro in terms of significant weight loss and improvements in obesity-related health conditions far outweigh the potential for side effects. Clinical trials have demonstrated not only impressive weight loss results but also improvements in cardiovascular risk factors, blood pressure, cholesterol levels, and quality of life. Many patients report feeling more energetic, experiencing less joint pain, sleeping better, and gaining confidence as they lose weight with Mounjaro.

Success with Mounjaro requires commitment not just to taking the medication, but to making the lifestyle changes that support long-term weight management. The medication is a powerful tool, but it works best when combined with healthier eating habits, regular physical activity, adequate sleep, stress management, and ongoing support. At Bodyline, we provide all these elements as part of our comprehensive programme, giving you the best possible chance of achieving and maintaining your weight loss goals.

Book a consultation at Bodyline Clinic to discuss whether Mounjaro is the right weight loss treatment for you. Our experienced team will assess your individual circumstances, explain all your options, and help you develop a personalised treatment plan that prioritises both your safety and your success. With convenient clinic locations across the Northwest and online consultations available UK-wide, accessing expert weight loss support has never been easier. Call 0800 995 6036 today to take the first step towards a healthier, happier you.