Weight Loss Injections

What Are Weight Loss Injections?

Weight loss injections are medications administered subcutaneously, belonging to a drug class medically referred to as GLP-1 receptor agonists. GLP-1 (Glucagon-Like Peptide-1) is a hormone naturally secreted by the body that plays an important role in blood sugar regulation and appetite control. Weight loss injections work by mimicking the effect of this hormone.

These medications act through the following mechanisms:

• Regulate insulin secretion from the pancreas
• Slow down gastric emptying
• Prolong the feeling of satiety
• Send signals to the appetite center in the brain, reducing hunger
• Help maintain more balanced blood sugar levels after meals

As a result, the patient consumes fewer calories on a daily basis and weight loss occurs gradually.

Which Weight Loss Injections Are Used?

Some of the most commonly used weight loss injections today include:

Semaglutide: A GLP-1 receptor agonist administered once a week. It is an approved active ingredient for type 2 diabetes and chronic weight management. It is known under various brand names such as Ozempic, Wegovy, and Rybelsus.

Liraglutide: A GLP-1 receptor agonist administered once a day. It is available under brand names such as Saxenda and Victoza.

Tirzepatide: A newer-generation medication that targets both GLP-1 and GIP (Glucose-Dependent Insulinotropic Polypeptide) receptors. Known as Mounjaro and Zepbound, it is administered once a week. Its dual mechanism of action has shown noteworthy results in clinical studies.

The choice between these medications is made based on the patient's weight, accompanying conditions, treatment goals, and the physician's evaluation.

Who Is It Suitable For?

Weight loss injections are not suitable for every individual struggling with weight. Generally accepted candidate criteria include:

• Individuals with a Body Mass Index (BMI) of 30 or higher
• Patients with a BMI between 27-30 who have obesity-related conditions (type 2 diabetes, hypertension, sleep apnea, high cholesterol)
• Those who have not achieved sufficient results through diet and exercise
• Adults over 18 years old in suitable general health for the treatment
• Patients able to commit to regular medical follow-up

Weight loss injections are not used or are evaluated with caution in the following cases:

• Pregnancy and breastfeeding
• Patients with type 1 diabetes
• Personal or family history of medullary thyroid cancer or MEN2 syndrome
• History of pancreatitis
• Individuals with allergies to the medication's components
• Patients with serious gastrointestinal conditions

How Does the Treatment Process Work?

Pre-Treatment Evaluation

Before starting treatment, a comprehensive medical evaluation is performed. During this process:

• A detailed medical history is taken
• Blood tests are ordered (HbA1c, fasting glucose, liver and kidney function, thyroid hormones)
• BMI and metabolic markers are assessed
• Accompanying conditions are examined
• A dietitian consultation is recommended

Dose Adjustment

Weight loss injection therapy generally starts with a low dose, which is gradually increased over several weeks to minimize side effects. This process varies depending on the type of medication.

Administration

The injection is self-administered by the patient subcutaneously in the abdomen, upper arm, or thigh. Administration training is provided by a physician or nurse. Typically:

• Semaglutide and tirzepatide: Once a week
• Liraglutide: Once a day

Regular Follow-Up

Regular check-ups are conducted throughout the treatment. Weight changes, blood tests, and possible side effects are evaluated, and the treatment plan is updated accordingly.

Nutrition and Lifestyle Recommendations

The effectiveness of weight loss injections increases significantly when supported by nutrition and lifestyle changes, rather than relying on the medication alone. Key recommendations include:

• A balanced, high-protein diet
• Avoiding sugar and processed foods
• Adequate water intake
• Regular physical activity (at least 150 minutes per week)
• Eating slowly and chewing thoroughly
• Limiting snacks
• Maintaining good sleep quality

These recommendations both support weight loss during treatment and help reduce the side effects of the medication.

Expected Outcomes

Clinical studies on patients using weight loss injections generally observe the following outcomes:

• Loss of 10-22% of excess weight over a 12-18 month treatment period
• Significant reduction in waist circumference
• Improvement in blood sugar and HbA1c levels
• Positive changes in blood pressure and cholesterol levels
• Reduction in fatty liver
• Notable improvement in quality of life

Outcomes vary from individual to individual. The specific medication used, the patient's metabolism, and adherence to lifestyle recommendations directly affect results.

Possible Side Effects

Although weight loss injections are relatively safe, some side effects may occur. The most common include:

Common side effects:

• Nausea (especially in the first weeks of treatment)
• Vomiting
• Diarrhea or constipation
• Abdominal pain
• Bloating
• Fatigue due to decreased appetite

Less common side effects:

• Reflux and heartburn
• Headache
• Dizziness
• Temporary redness or itching at the injection site

Rare but serious side effects:

• Acute pancreatitis
• Gallstones
• Changes in kidney function
• Low blood sugar (especially when used with diabetes medications)

Most side effects diminish as treatment progresses. In case of severe or persistent side effects, a physician should be consulted immediately.

What Happens When Treatment Is Discontinued?

When weight loss injection treatment is discontinued, weight regain may occur if the patient does not maintain dietary and lifestyle changes. This is related to the discontinuation of the medication's effects on appetite and gastric emptying. Therefore:

• The treatment process should be considered as an opportunity to establish lasting lifestyle changes
• How treatment is discontinued should be planned together with the physician
• Some patients may require long-term or low-dose maintenance therapy

Comparison with Surgical Methods

Weight loss injections and bariatric surgical methods address different patient groups:

The decision about which method is more suitable should be based on an evaluation of the patient's BMI, health condition, expectations, and lifestyle.