What Are GLP-1 Medications? Active Ingredients And Uses

GLP-1 medications are prescription treatments that mimic the effects of the naturally occurring GLP-1 hormone in the body or support this mechanism. The GLP-1 hormone is secreted from the intestines after meals and plays a role in blood sugar control, insulin response, gastric emptying, appetite and the feeling of satiety.

This medication group is most commonly discussed in type 2 diabetes treatment, blood sugar control and weight management processes in certain individuals. The World Health Organization states that GLP-1 receptor agonists are a class of medicines that can help lower blood sugar, support weight loss and reduce the risk of heart and kidney complications in people with type 2 diabetes. In WHO’s guideline on obesity treatment, the active ingredients liraglutide, semaglutide and tirzepatide are specifically addressed.

However, GLP-1 medications are not suitable for everyone. The decision to use them should be made based on the person’s blood values, existing diseases, weight status, medications used and physician evaluation.

How Do GLP-1 Medications Work?

GLP-1 medications activate GLP-1 receptors in the body and create responses similar to the effects of the natural hormone. This mechanism becomes especially more evident when blood sugar rises. Therefore, the effect of GLP-1 medications on blood sugar is generally described as glucose-dependent.

The effects of these medications are not limited to blood sugar. Slowed gastric emptying, earlier satiety, prolonged fullness and reduced appetite are also related to this mechanism. Therefore, GLP-1 medications are a closely followed drug group in both diabetes and weight management.

Effect On Blood Sugar

GLP-1 medications may help post-meal blood sugar response progress in a more balanced way. When blood sugar rises, they may support insulin secretion from the pancreas and reduce glucagon secretion.

The main effects on blood sugar are:

• Supporting Insulin Response: May contribute to increased insulin secretion when blood sugar rises.
• Reducing Glucagon: May help limit excess glucose release from the liver into the blood.
• Post-Meal Balance: May support more controlled blood sugar rise after meals.
• HbA1c Follow-Up: HbA1c value is important in monitoring long-term blood sugar control.
• Need For Personal Follow-Up: Blood sugar should be monitored regularly in people with diabetes.

Effect On Appetite And Satiety

GLP-1 medications may affect appetite and satiety centers in the brain. This effect may contribute to earlier satiety, longer fullness and reduced total food intake during the day.

The effects on appetite and satiety can be explained as follows:

• Earlier Satiety: The person may feel full with smaller portions.
• Longer Satiety Duration: The time to feel hungry again after meals may be delayed.
• Reduced Snacking Desire: Uncontrolled eating behavior during the day may decrease.
• Portion Control: Adherence to the nutrition plan may become easier.
• Emotional Eating Distinction: It is important to distinguish hunger-driven and habit-driven eating behavior.

Effect On Gastric Emptying

GLP-1 medications may slow gastric emptying. This means that food passes from the stomach to the intestines more slowly. Thus, post-meal satiety may last longer and blood sugar may rise more steadily.

Effects related to gastric emptying are:

• Long-Lasting Satiety: When gastric emptying slows, the person may feel full for longer.
• Blood Sugar Balance: Sudden post-meal blood sugar spikes may decrease.
• Nausea Risk: Slowed gastric emptying may cause nausea in some people.
• Feeling Of Bloating: Especially in the initial period, a feeling of stomach fullness may occur.
• Need For Nutrition Routine: Small and balanced meals may make the process more comfortable.

Which Active Ingredients Do GLP-1 Medications Contain?

GLP-1 medications consist of various active ingredients with different durations of action, forms of administration and areas of use. These active ingredients should be evaluated at the medical active ingredient level, not by brand name. Because treatment selection should be made according to the person’s health status, not according to the popularity of the medication.

The World Health Organization announced in its 2025 Essential Medicines List update that it added the GLP-1 receptor agonists semaglutide, dulaglutide and liraglutide, and the GLP-1/GIP dual receptor agonist tirzepatide. WHO states that these medicines are especially evaluated as glucose-lowering therapy in certain high-risk adults with type 2 diabetes.

Semaglutide

Semaglutide is one of the active ingredients that activates GLP-1 receptors. It may be evaluated to support blood sugar control in type 2 diabetes treatment. It may also be considered by physician decision in the weight management process for people who meet certain medical criteria.

Things to know about semaglutide are:

• It Is A GLP-1 Receptor Agonist: It may create responses similar to the effects of the natural GLP-1 hormone.
• It Can Be Evaluated In Blood Sugar Control: It can be planned by the physician in type 2 diabetes management.
• It May Be Associated With Weight Management: It may support some people through appetite and satiety mechanisms.
• It Requires Physician Follow-Up: The decision to use it should be made with personal health evaluation.
• Side Effect Monitoring Is Important: Nausea, stomach discomfort or digestive changes may occur.

Liraglutide

Liraglutide is another active ingredient among GLP-1 receptor agonists. It may be associated with blood sugar control, appetite regulation and weight management processes. Its area of use and suitability should be determined according to the person’s clinical condition.

Key points about liraglutide are:

• It Mimics The GLP-1 Mechanism: It may act through GLP-1 receptors.
• It Can Be Evaluated In Type 2 Diabetes: It may contribute to blood sugar control.
• It May Be Considered In Weight Management: It may be related to appetite control in certain people.
• Personal Suitability Is Required: It is not suitable for everyone who wants to lose weight.
• It Should Be Planned With Lifestyle: Nutrition and movement routine are part of the process.

Dulaglutide

Dulaglutide is one of the active ingredients among GLP-1 receptor agonists that can be evaluated in type 2 diabetes treatment. It may be planned by the physician especially to support blood sugar control.

Basic information about dulaglutide includes:

• It Is Related To Blood Sugar Control: It can be evaluated in type 2 diabetes management.
• It Activates GLP-1 Receptors: It may create responses similar to natural GLP-1 effects.
• It Is Known For Its Long Duration Of Action: Application frequency may vary depending on the active ingredient.
• Indirect Effects On Weight May Be Seen: Appetite and satiety mechanisms may be affected.
• It Requires Follow-Up: Blood sugar, digestive complaints and general health status should be monitored.

Tirzepatide

Tirzepatide is a dual-acting active ingredient associated with the GIP receptor mechanism in addition to the GLP-1 receptor effect. The World Health Organization included tirzepatide as a GLP-1/GIP dual receptor agonist in its 2025 Essential Medicines List update.

Things to know about tirzepatide are:

• It Is Related To A Dual Receptor Mechanism: It may affect metabolic responses through GLP-1 and GIP pathways.
• It Can Be Evaluated In Type 2 Diabetes: It may be considered by physician decision for blood sugar control.
• It May Be Associated With Weight Management: It may affect appetite, satiety and weight control in certain individuals.
• Personal Suitability Is Important: It may not be an appropriate treatment option for every person.
• Specialist Follow-Up Is Required: Side effects, blood values and general metabolic status should be monitored.

Exenatide

Exenatide is one of the older active ingredients among GLP-1 receptor agonists. It may be evaluated to support blood sugar management in type 2 diabetes treatment. Its duration of action and application form may differ from other active ingredients.

Things to know about exenatide are:

• It Is In The GLP-1 Group: It is an active ingredient that activates GLP-1 receptors.
• It Is Related To Type 2 Diabetes: It may be evaluated for blood sugar control.
• Application Form May Vary: Form and frequency of use are determined according to the treatment plan.
• Digestive Side Effects May Occur: Nausea and stomach discomfort may be seen.
• Physician Decision Is Required: It should not be used without personal medical evaluation.

Lixisenatide

Lixisenatide is one of the active ingredients evaluated among GLP-1 receptor agonists. It may be considered by the physician especially in processes related to post-meal blood sugar control.

Basic points about lixisenatide are:

• It Mimics GLP-1 Effect: It works through receptor activation.
• It Is Related To Post-Meal Blood Sugar: It may be considered in postprandial blood sugar control.
• It May Affect Gastric Emptying: It may play a role in satiety and digestion.
• Suitability Is Personal: The same option may not be suitable for every person with diabetes.
• Regular Follow-Up Is Required: Blood sugar and side effects should be monitored.

What Are GLP-1 Medications Used For?

GLP-1 medications are most commonly associated with type 2 diabetes treatment and blood sugar control. In addition, some active ingredients may be evaluated in the weight management process for people who meet certain criteria. The World Health Organization specifically addresses recommendations for liraglutide, semaglutide and tirzepatide in its guideline on obesity treatment in adults.

However, these areas of use are not automatically suitable for everyone. GLP-1 medications should not be used without evaluating blood sugar, weight, cholesterol, blood pressure, fatty liver, kidney functions and lifestyle together.

Use In Type 2 Diabetes Treatment

In type 2 diabetes treatment, GLP-1 medications may be evaluated by the physician to support blood sugar control. These medications may play a role especially in post-meal blood sugar response, insulin secretion and glucagon balance.

Use in type 2 diabetes is related to the following goals:

• Blood Sugar Control: Fasting and post-meal blood sugar values are monitored.
• Monitoring HbA1c Level: Long-term blood sugar control is evaluated.
• Supporting Glucagon Balance: Glucose release from the liver can be controlled.
• Contribution To Weight Management: Weight control may be indirectly supported in some people.
• Personal Treatment Plan: Diabetes treatment should be planned differently for each person.

Use In Weight Management

GLP-1 medications may support weight management in some people through reduced appetite, prolonged satiety and easier portion control. However, these medications should not be seen as a rapid weight-loss method.

Evaluation in weight management should include the following headings:

• Body Mass Index: Whether weight poses a medical risk is evaluated.
• Metabolic Risks: Insulin resistance, diabetes risk, cholesterol and blood pressure are examined.
• Eating Habits: The person’s daily nutrition routine should be analyzed.
• Physical Activity Level: Movement plan is part of weight management.
• Long-Term Follow-Up: Maintaining weight is as important as weight loss.

Are GLP-1 Medications Suitable For Everyone?

GLP-1 medications are not suitable for everyone. While they may be an effective and safe option in some people, they may create risk or require careful follow-up in others. Therefore, medication decisions should not be made only according to weight, appetite or social media comments.

The person’s medical history, pregnancy or breastfeeding status, history of pancreatic disease, gallbladder problems, history of eating disorder, kidney functions and other medications used must be evaluated.

People Who Require Careful Evaluation

In some groups, the use of GLP-1 medications should be evaluated more carefully. In these people, treatment suitability, risk-benefit balance and follow-up frequency should be determined by the physician.

Conditions requiring careful evaluation include:

• Pregnancy And Breastfeeding: Medication use during these periods requires special evaluation.
• History Of Pancreatic Disease: Previous pancreatic problems must be questioned.
• Gallbladder Problems: Follow-up may be needed in terms of abdominal pain and digestive complaints.
• History Of Eating Disorder: Appetite-suppressing treatments should be handled carefully from a psychological perspective.
• Multiple Medication Use: Drug interactions and general health status should be evaluated.

What Are The Side Effects Of GLP-1 Medications?

The side effects of GLP-1 medications may vary from person to person. The most common side effects are generally related to the digestive system. Nausea, vomiting, diarrhea, constipation, stomach fullness and decreased appetite are among the most discussed complaints in this group.

Side effects may be more evident especially at the beginning of treatment or during dose changes. However, physician evaluation should not be delayed in symptoms that are long-lasting, severe or affect daily life.

Common Side Effects

The effects of GLP-1 medications on the digestive system may be related to slowed gastric emptying and decreased appetite. These effects are not seen at the same level in every person.

Common side effects may include:

• Nausea: It may be common in the initial period.
• Vomiting: If it lasts long, attention should be paid to fluid loss.
• Constipation: Fiber, fluid and movement routine should be monitored.
• Diarrhea: A change in bowel habits may occur.
• Stomach Fullness: A feeling of discomfort may occur especially after meals.

Symptoms That Should Be Taken Seriously

Some symptoms may require more careful evaluation. When these symptoms are seen, the treatment plan should be reviewed and specialist opinion should be obtained.

Symptoms that should be taken seriously include:

• Severe Abdominal Pain: Evaluation may be needed in terms of pancreas or gallbladder.
• Persistent Vomiting: It may create a risk of fluid loss and electrolyte imbalance.
• Dizziness And Weakness: It may be associated with inadequate nutrition or blood sugar change.
• Signs Of Low Blood Sugar: Trembling, sweating, palpitations or confusion are important.
• Long-Lasting Digestive Complaints: Treatment adherence and dose plan should be re-evaluated.

How Should Nutrition Be While Using GLP-1 Medications?

Appetite may decrease while using GLP-1 medications; however, this does not mean that the person is eating adequately and in a balanced way. Protein, fiber, vitamin, mineral and fluid intake should be especially monitored. Otherwise, muscle loss, weakness or nutritional deficiencies may develop.

The goal in the weight management process should not only be to reduce the number on the scale. Maintaining body composition, supporting muscle mass, balancing blood sugar and creating sustainable habits is a healthier approach.

Things To Consider In Nutrition

During the GLP-1 process, the nutrition plan should be prepared personally. Very low-calorie, single-type or unsustainable diets should be avoided. Especially during periods when appetite decreases, adequate food intake should be planned consciously.

Things to consider in nutrition are:

• Adequate Protein: Important for maintaining muscle mass.
• Fiber-Rich Foods: Provide support for bowel routine and satiety.
• Fluid Intake: Fluid balance is important in cases of vomiting, diarrhea or eating less.
• Balanced Meals: May help reduce blood sugar fluctuations.
• Vitamin And Mineral Follow-Up: Deficiencies should be checked regularly.

Which Checks Should Be Done Before Starting GLP-1 Medications?

Before GLP-1 medications come to the agenda, the person’s general health status and metabolic profile should be evaluated. This evaluation is important not only to determine suitability for medication, but also to understand the underlying causes of weight gain or blood sugar irregularity.

Fasting blood sugar, HbA1c, insulin level, liver and kidney functions, lipid profile, thyroid functions and vitamin-mineral balance may be evaluated according to the person. Existing medications, family history and lifestyle should also be considered.

Tests That Can Be Evaluated

The tests to be performed before GLP-1 medications may vary according to the person’s health history and complaints. The physician should determine which tests are necessary according to personal risks.

Tests that can be evaluated are:

• Fasting Blood Sugar: Helps evaluate blood sugar metabolism.
• HbA1c: Shows the average blood sugar level over the last 2-3 months.
• Fasting Insulin Level: May give an idea about insulin resistance.
• Lipid Profile: Shows cholesterol and triglyceride values.
• Liver And Kidney Functions: Important for medication suitability and general health follow-up.

What Happens If GLP-1 Medications Are Used Unconsciously?

Unconscious use of GLP-1 medications may create serious health risks. It is not right to use them without evaluating the person’s suitability, without prescription or with the expectation of rapid weight loss. These medications are treatments that require medical follow-up.

Unconscious use may cause side effects to go unnoticed, blood sugar fluctuations, inadequate nutrition, fluid loss, muscle loss or underlying health problems to be overlooked. Therefore, GLP-1 medications should only be addressed with specialist evaluation.

Risks Of Uncontrolled Use

Uncontrolled use reduces the safety of the treatment process. Even if the person experiences appetite decrease in the short term, they may not achieve healthy and sustainable results in the long term.

Risks of uncontrolled use include:

• Lack Of Side Effect Monitoring: Nausea, vomiting or abdominal pain may be overlooked.
• Blood Sugar Fluctuations: Risk may increase together with diabetes medications.
• Inadequate Nutrition: Decreased appetite may lead to nutritional deficiency.
• Muscle Loss: Rapid weight loss may negatively affect muscle mass.
• Use In An Unsuitable Person: It may create risk in some health conditions.

Evaluate Your GLP-1 And Metabolic Health Process With Happ Health

GLP-1 medications are an important medication group related to blood sugar control, appetite regulation, satiety and weight management. However, the suitability of these medications varies from person to person and the decision to use them should not be made with general information alone.

Happ Health, as a digital health platform, offers a solution that facilitates access to online endocrinology and metabolic disease specialists. By receiving expert advice based on your blood test results, weight management goals, diabetes risk, and metabolic health status, you can create a more informed roadmap for your health.

References

• World Health Organization. WHO Issues Global Guideline On The Use Of GLP-1 Medicines In Treating Obesity. 2025.
  
  
• World Health Organization. WHO Updates List Of Essential Medicines To Include Key Cancer, Diabetes Treatments. 2025.
  
  
• World Health Organization. Obesity: GLP-1 Therapies. 2025.
  
  
• World Health Organization. WHO Model Lists Of Essential Medicines. 2025.