GLP-1 receptor agonists—also known as GLP-1 analogues, GLP-1 medications, or, more commonly, “weight-loss injections”—have gained widespread attention because of their effects on body weight. Names such as semaglutide, liraglutide, and tirzepatide frequently appear in the media, on social networks, and in conversations about obesity. However, several of these therapies were initially developed to treat type 2 diabetes, and they do not all have the same approved uses, formulations, or doses.
These medications act on mechanisms involved in blood glucose regulation, digestion, appetite, and satiety. Some products are used to help manage type 2 diabetes, while certain formulations are also approved for the long-term treatment of overweight and obesity.
Before considering treatment, it is important to understand these differences and learn which health factors and biomarkers may be assessed beforehand. GLP-1 medications require professional prescription and monitoring to select an appropriate option, evaluate the response, and reduce potential risks.
What Is GLP-1 and What Does It Do in the Body?
GLP-1, short for glucagon-like peptide-1, is a hormone released by the intestine after eating. It belongs to a group of hormones called incretins, which help the body respond to incoming nutrients and contribute to blood glucose regulation.
Its main functions include:
| 🩸 Insulin Release | ⚖️ Glucagon Regulation | ⏳ Gastric Emptying | 🧠 Appetite and Satiety |
|---|---|---|---|
| Stimulates insulin release when blood glucose levels rise. | Reduces, under certain conditions, the signals that trigger the release of stored glucose. | Slows gastric emptying and helps you feel full for longer. | Sends satiety signals to the brain and helps regulate appetite. |
The GLP-1 naturally produced by the body remains active for only a short time. GLP-1 receptor agonists mimic some of its actions but are designed to remain active longer so they can be used as a treatment.
What Are GLP-1 Receptor Agonists?
GLP-1 receptor agonists are medications that reproduce some of the actions of this natural hormone for a longer period. They may also be referred to as GLP-1 analogues, incretin mimetics, or simply GLP-1 medications.
Depending on the active ingredient and formulation, they may be administered as daily or weekly injections. Certain oral tablet formulations are also available.
This group includes exenatide, lixisenatide, dulaglutide, liraglutide, and semaglutide. Tirzepatide is also commonly discussed alongside these treatments because of its related metabolic effects, although it does not act exclusively on the GLP-1 receptor.
Treatment duration, dosage, formulation, and approved uses vary between products. The choice depends on each medication’s authorization, the treatment goals, existing health conditions, other medications, and individual tolerance.
What Are GLP-1 Medications Used For? Main Uses
GLP-1 medications are primarily used to treat type 2 diabetes and, in specifically approved products, to support the management of overweight and obesity.
| 🔎 Category | 🩸 Type 2 diabetes | ⚖️ Overweight and obesity |
|---|---|---|
| Main goal 🎯 | To improve blood glucose control. | To support sustained weight loss and improve weight-related health. |
| How can they help? ⚙️ | They stimulate insulin release when blood glucose rises and reduce glucagon release. | They reduce appetite and cravings, prolong satiety, and may decrease food intake. |
| Important considerations 📌 | They are not insulin and do not automatically replace it. Some products may also provide cardiovascular or kidney benefits in certain patients. | Individual responses vary, and some weight may be regained after treatment is discontinued. Treatment should be combined with a healthy diet, physical activity, and professional monitoring. |
Not all GLP-1 medications are approved for both uses. The indication depends on the specific product, treatment goals, health history, and professional assessment.
Who Might Consider GLP-1 Treatment?
These medications may be considered for people with type 2 diabetes, obesity, or—depending on the product’s specific indication—overweight accompanied by related health conditions. The decision should not be based solely on the desire to lose a certain amount of weight.
Before prescribing treatment, a healthcare professional may assess:
- The diagnosis and treatment goals.
- Current weight and how it has changed over time.
- Blood glucose control.
- The presence of cardiovascular or kidney disease.
- Current medications.
- Digestive, pancreatic, or gallbladder history.
- The possibility of pregnancy.
- The expected benefits and risks.
- The ability to continue treatment and attend follow-up appointments.
Treatment should form part of an individualized, long-term health strategy rather than a quick or exclusively cosmetic intervention. It is also important to obtain these medications through authorized channels. The Pan American Health Organization has warned about misuse and the circulation of falsified products, which may present problems related to quality, dosage, and safety.
What Should Be Evaluated Before Starting Treatment?
Before starting treatment with a GLP-1 medication, a comprehensive assessment is recommended. This may include reviewing the person’s medical history and current medications, as well as performing certain laboratory tests.
A Pre-GLP-1 panel can provide an initial overview of metabolic, kidney, thyroid, and blood health while establishing baseline values that may be useful during follow-up. Results should be interpreted alongside the person’s health history, symptoms, and the treatment being considered.
Medical History and Medications to Discuss
It is important to tell the healthcare professional about:
- The use of insulin or other diabetes medications.
- A history of hypoglycemia.
- Kidney disease.
- Persistent nausea, vomiting, or other digestive problems.
- A history of pancreatitis or gallbladder disease.
- Allergic reactions to medications.
- Pregnancy, breastfeeding, or plans to become pregnant.
- A personal or family history of medullary thyroid cancer or multiple endocrine neoplasia type 2, a rare inherited condition.
- Upcoming surgeries or procedures requiring anesthesia or sedation.
When a GLP-1 medication is used with insulin or certain other diabetes medications, doses may need to be adjusted and blood glucose monitored more closely to reduce the risk of hypoglycemia.
These treatments can also delay gastric emptying. This may affect the absorption of certain oral medications and may be relevant before some procedures. The healthcare team should determine whether treatment needs to be continued or temporarily paused; medications should never be changed without professional guidance.
Which Tests May Be Performed Before GLP-1 Treatment?
As part of the initial assessment, a Pre-GLP-1 panel may include tests that provide information about blood glucose, blood cells, cardiometabolic health, and kidney and thyroid function. These results establish a useful baseline for planning and monitoring treatment.
1. Fasting Blood Glucose
This test measures the concentration of glucose in the blood after several hours without food. It helps establish the initial glycemic status and identify results that may require further assessment, particularly in people with diabetes or metabolic risk factors.
2. Complete Blood Count
A complete blood count evaluates red blood cells, white blood cells, hemoglobin, hematocrit, platelets, and other blood parameters. It provides a general overview of hematological health and may help identify abnormalities that should be considered before treatment.
3. Lipid Panel
A lipid panel includes total cholesterol, HDL cholesterol, LDL cholesterol, triglycerides, and the total cholesterol-to-HDL ratio. The results help build a broader picture of cardiometabolic health, particularly in people with diabetes, obesity, or other cardiovascular risk factors.
4. Creatinine and Estimated Glomerular Filtration Rate
Creatinine and the estimated glomerular filtration rate, or eGFR, help assess kidney function and establish an initial baseline. This information is especially relevant for people with pre-existing kidney disease or when digestive side effects make it difficult to maintain adequate hydration.
5. Thyroid Panel
This panel includes ultrasensitive TSH, total T4, and free T4. It provides information about thyroid function, as thyroid disorders can affect weight, energy levels, and metabolism.
6. Kidney Function Tests
These include urea, uric acid, calcium, and phosphorus. The results complement the kidney and metabolic assessment and are interpreted together with creatinine, eGFR, and the person’s health history.
7. Total Insulin
Measuring total insulin provides additional information about the body’s metabolic response. When interpreted alongside blood glucose and other biomarkers, it may contribute to a more complete picture of glucose metabolism and establish a baseline for professional evaluation.
Depending on the person’s health history, symptoms, and the medication being considered, a healthcare professional may recommend additional tests to personalize the assessment.
Common Side Effects and Warning Signs
The most common side effects of GLP-1 medications are digestive and often appear when treatment begins or the dose is increased. They may include:
- Nausea or vomiting.
- Diarrhea or constipation.
- Abdominal pain or bloating.
- Indigestion and reduced appetite.
- Headache or injection-site reactions.
Persistent digestive symptoms can make it difficult to maintain adequate hydration and nutrition. For this reason, it is important to consume enough fluids, food, and protein during treatment.
Medical attention should be sought for severe or persistent abdominal pain, repeated vomiting, signs of dehydration, symptoms of hypoglycemia, or a severe allergic reaction. Side effects that make it difficult to eat or continue treatment should also be evaluated.
Do not stop, restart, or change the dose of a medication without professional guidance.
Health Assessment Before GLP-1 Treatment in Buenos Aires
If a healthcare professional has recommended an assessment before you begin treatment with a GLP-1 medication, SaludyVos offers a Pre-GLP-1 Health Check with at-home blood collection in Buenos Aires.
The panel includes metabolic, kidney, thyroid, and hematological biomarkers, including fasting blood glucose, total insulin, a lipid panel, creatinine, eGFR, a thyroid panel, and a complete blood count.
This health check provides a general overview of your health and establishes baseline values that may be useful during professional assessment and follow-up. Based on your medical history, symptoms, and the treatment being considered, a healthcare professional can interpret the results and determine whether any additional tests are needed.
Treatment Tailored to Each Person
GLP-1 medications can provide important benefits when they are appropriately prescribed as part of a comprehensive approach. Beyond changes in body weight, treatment should also take blood glucose, kidney function, cardiovascular health, digestive tolerance, nutrition, muscle mass, and other medications into account.
An initial assessment helps establish a clear starting point and identify areas that may need attention. With this information and appropriate professional follow-up, the response to treatment can be evaluated, necessary adjustments can be made, and care can remain safer, more personalized, and sustainable. The goal is not simply to reach a particular number on the scale, but to support meaningful health improvements that can be maintained over time.