Weight loss injections

Weight loss injections

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Table of contents
OverviewUnderstanding semaglutide medicationsOzempicWegovy and SaxendaHow to use Wegovy and Saxenda?Comparing semaglutide medicationsDosage and administrationEffectiveness and benefitsImportant safety informationSide effects and considerationsChoosing the right medicationAdditional lifestyle changesConclusion
Navin Khosla NowPatientGreen tick
Medically reviewed by Navin Khosla, BPharm and written by Rajive Patel, BPharm - Updated on 26 Jan 2024
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In a world where obesity rates continue to rise, the search for effective weight loss solutions is more important than ever. One emerging trend in the field of weight loss is the use of injectable medications, specifically semaglutide-based drugs. These medications, including Ozempic, Wegovy, Saxenda, Mounjaro, and Zepbound, have shown promising results in promoting weight loss in adults who are overweight or are suffering with obesity.

In this comprehensive guide, we will explore the benefits, differences, and considerations of these weight loss injections. We will delve into their uses, safety information, possible side effects, and more. By the end of this article, you will have a clear understanding of these medications and their potential benefits.

Understanding semaglutide medications

Semaglutide is a GLP-1 receptor agonist and is the active ingredient found in a group of medications designed to promote weight loss. These medications, such as Ozempic, Wegovy, Mounjaro, and Zepbound, work by decreasing appetite and slowing down digestion. By mimicking the effects of glucagon-like peptide-1 (GLP-1) hormones in the body, semaglutide medications help individuals feel full and satisfied, leading to reduced food intake and subsequent weight loss.


Ozempic was initially developed for the treatment of type 2 diabetes. However, it has gained attention for its off-label use as a weight loss medication. The main active ingredient in Ozempic is semaglutide, which mimics the glucagon-like peptide-1 (GLP-1) hormone. By increasing insulin production and signaling fullness in the brain, Ozempic can effectively help individuals with weight loss.

Wegovy and Saxenda

Wegovy (semaglutide) and Saxenda (liraglutide) are brand names of injectable prescription medications that have been specifically designed to aid in healthy weight loss. They also work by decreasing appetite, helping individuals reduce their calorie intake and achieve sustained weight loss. Both medications are intended for use in combination with a reduced-calorie diet and increased physical activity.


Wegovy is specifically used for chronic weight management, with higher doses of semaglutide compared to Ozempic. It has shown remarkable results in clinical trials, with one in three individuals losing on average 20% of their body weight. Wegovy is indicated for adults and children aged 12 years and older who have obesity (BMI (body mass index) ≥30) or excess weight (BMI ≥27) with weight-related medical problems. The once-weekly injection of Wegovy, combined with a reduced-calorie diet and exercise, offers a promising solution for individuals struggling with obesity or being overweight.


Saxenda is also a GLP-1 receptor agonist, with liraglutide as its active ingredient. It is indicated for adults with obesity (BMI ≥30) or excess weight (BMI ≥27) who have weight-related medical problems, as well as children aged 12 to 17 years with a body weight above 132 pounds (60 kg) and obesity. Saxenda is also injected under the skin. The recommended injection sites are the abdomen, thigh, or upper arm.

How to use Wegovy and Saxenda?

Both Wegovy and Saxenda are administered through subcutaneous injections. It is crucial to follow the instructions provided by your healthcare provider and the medication guide carefully. The injections should be given once a week. Injection sites should be rotated to reduce the risk of lumps under the skin.


Mounjaro, like Ozempic, contains semaglutide but is primarily intended for the management of type 2 diabetes. However, off-label use of Mounjaro has demonstrated significant weight loss in individuals. With its ability to regulate blood sugar levels and reduce food intake, Mounjaro serves as an alternative weight loss medication for those with diabetes.


The most recent addition to the semaglutide family is Zepbound, approved for chronic weight management. Zepbound, also known as tirzepatide, has been hailed as the most effective weight loss drug currently available. Clinical studies have shown that individuals taking Zepbound experienced significant weight loss, with some losing up to 18% of their body weight. With its unique mechanism of action, Zepbound offers a promising option for individuals seeking effective weight loss solutions.

Comparing semaglutide medications

When comparing the various semaglutide medications, it is essential to understand their similarities and differences. While Ozempic and Wegovy share the same active ingredient, their approved uses differ, with Ozempic primarily indicated for type 2 diabetes and Wegovy specifically approved for weight management. Similarly, Mounjaro and Zepbound contain the same active ingredient, tirzepatide, with Mounjaro primarily used for diabetes management and Zepbound approved for weight management. It is crucial to consult with healthcare professionals to determine the most suitable medication based on individual needs.

Dosage and administration

The dosages and administration of semaglutide medications vary depending on the specific drug. Ozempic and Wegovy are both administered once weekly via injection. The initial dosing for Ozempic starts at 0.25 mg, gradually increasing to 1 or 2 mg to control blood sugar levels. Wegovy follows a similar dosing regimen, starting with 0.25 mg, increasing to 1.7 mg after four months, and finally to 2.4 mg from month five onwards. Mounjaro, Saxenda and Zepbound have their own dosing guidelines, which should be followed as prescribed by healthcare professionals.

Effectiveness and benefits

Semaglutide medications have shown remarkable effectiveness in promoting weight loss. Clinical trials have demonstrated significant reductions in body weight among individuals taking these medications, with some achieving weight loss of up to 20%. The benefits of weight loss extend beyond cosmetic improvements, as it can also lead to a reduced risk of other health conditions, such as heart disease, type 2 diabetes, and other weight-related conditions. By aiding in weight management, semaglutide medications offer a potential solution for individuals struggling with obesity or overweight.

Important safety information

Before considering the use of these weight loss treatments, it is crucial to understand the potential risks and precautions associated with these medications. Consultation with a healthcare provider is essential to determine if these injections are suitable for you.

Thyroid tumors and cancer

These medications have been associated with an increased risk of thyroid tumors, including thyroid cancer. Symptoms of thyroid cancer may include a lump or swelling in the neck, hoarseness, trouble swallowing, or shortness of breath. If you have a history of thyroid cancer or an endocrine system condition called Multiple Endocrine Neoplasia syndrome type 2 (MEN 2), these medications should not be used.

Allergic reactions

Serious allergic reactions can occur with the use of weight loss injections. Symptoms of an allergic reaction may include swelling of the face, lips, tongue, or throat; difficulty breathing or swallowing; severe rash or itching; fainting; or rapid heartbeat. If you experience any of these symptoms, stop using the medication and seek medical help immediately.


Inflammation of the pancreas, known as pancreatitis, is a potential side effect of both Wegovy and Saxenda. Symptoms of pancreatitis include severe pain in the abdomen that does not go away, with or without vomiting. If you experience such symptoms, discontinue the medication and contact your healthcare provider immediately.

Gallbladder problems

GLP-1 receptor agonists may cause gallbladder problems, including the formation of gallstones. Symptoms of gallbladder problems may include severe stomach pain, nausea, vomiting, fever, yellowing of the skin or eyes (jaundice), or clay-colored stools. If you experience any of these symptoms, consult your healthcare provider.

Risk of Low Blood Sugar

In patients with type 2 diabetes, the use of GLP-1 receptor agonists may increase the risk of low blood sugar (hypoglycemia), especially when used in conjunction with other diabetes medications such as sulfonylureas or insulin. It is important to discuss with your healthcare provider how to recognize and treat low blood sugar, as well as monitor your blood sugar levels regularly.

Kidney Problems

Individuals with kidney problems may be at an increased risk of kidney failure when using GLP-1 receptor agonists. Dehydration caused by diarrhoea, nausea, or vomiting may exacerbate kidney problems. Therefore, it is essential to stay hydrated and report any symptoms of kidney problems, such as decreased urine output or swelling of the ankles, hands, or feet, to your healthcare provider.

Other Precautions

Before starting treatment with GLP-1 receptor agonists, inform your healthcare provider about any other medical conditions you have, including problems with your pancreas or kidneys, a history of depression or mental health issues, and if you are pregnant or planning to become pregnant. It is also important to disclose all medications, including prescription, over-the-counter drugs, vitamins, and herbal supplements, to your healthcare provider, as certain medications may interact with GLP-1 receptor agonists.

Side effects and considerations

As with any medication, semaglutide-based drugs may have side effects and considerations. The most common side effects reported include nausea, diarrhea, vomiting, constipation, stomach pain, headache, fatigue, upset stomach, loss of appetite, dizziness, bloating, belching, gas, heartburn, and respiratory symptoms such as a runny nose or sore throat.

In addition to the common side effects, these medications carry the risk of serious side effects, including pancreatitis, gallbladder problems, low blood sugar, kidney problems, allergic reactions, changes in vision, increased heart rate, depression, and thoughts of suicide. If you experience any severe symptoms or notice any changes in your mental health, it is crucial to seek immediate medical attention.

Individuals with a history of specific medical conditions, such as thyroid cancer or pancreatitis, should exercise caution and consult with healthcare professionals before starting these medications. It is also important to discuss potential drug interactions and any pre-existing medical conditions with healthcare providers.

Choosing the right medication

When considering these medications for weight loss, it is crucial to consult with healthcare providers to determine the most suitable option. Factors such as medical history, coexisting conditions, and personal preferences should be taken into account. Ozempic, Wegovy, Mounjaro, Saxenda, and Zepbound each have their own unique characteristics, and healthcare professionals can provide guidance on selecting the medication that aligns with individual needs and goals.

Additional lifestyle changes

While these medications offer significant benefits in weight loss, they are most effective when combined with lifestyle changes. Adopting a healthy and balanced diet, engaging in regular physical activity, and implementing behavior modifications can enhance the weight loss achieved with these medications. It is essential to approach weight loss as a holistic journey, incorporating both pharmacological interventions and sustainable lifestyle changes.


GLP-1 receptor agonists such as Ozempic, Wegovy, Saxenda Mounjaro, and Zepbound, have revolutionized the field of weight loss by offering effective pharmacological interventions. These medications, with their ability to decrease appetite and promote weight loss, provide hope for individuals who are overweight or struggling with obesity. Understanding the differences, benefits, and considerations associated with each medication is crucial in making informed decisions about weight loss management.

It is important to carefully consider the potential risks and benefits of these medications in consultation with your healthcare provider. By following a reduced-calorie diet, increasing physical activity, and adhering to your doctors prescribing guidelines and injection regimen, you may be able to achieve and maintain weight loss. Remember to stay informed about the possible side effects and report any concerns to your healthcare provider promptly.


Medical Disclaimer

NowPatient has taken all reasonable steps to ensure that all material is factually accurate, complete, and current. However, the knowledge and experience of a qualified healthcare professional should always be sought after instead of using the information in this page. Before taking any drug, you should always speak to your doctor or another qualified healthcare provider.

The information provided here about medications is subject to change and is not meant to include all uses, precautions, warnings, directions, drug interactions, allergic reactions, or negative effects. The absence of warnings or other information for a particular medication does not imply that the medication or medication combination is appropriate for all patients or for all possible purposes.

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