GLP-1 Contraindications: Who Should Not Take GLP-1
You have probably done some research about whether a GLP-1 medication is right for you. Maybe you are looking into what might work for your situation, or maybe you have been told by a provider that you should check whether it is safe given your medical history. The good news is that GLP-1 medications work well for many people. But they do not work for everyone. Some health conditions make GLP-1 medications unsafe, even if weight loss is desperately needed. This page walks through the complete picture of who cannot take these medications.
This is not medical advice. Your provider makes the final determination about whether a GLP-1 medication is safe and appropriate for you. But knowing the contraindications upfront can save you time and help you understand what information your provider will need.
What is a contraindication?
A contraindication is a medical condition that makes a medication unsafe or inappropriate to use. Some contraindications are absolute, meaning the medication should not be used under any circumstances. Others are relative, meaning the medication might be used, but only with careful provider evaluation and close monitoring.
GLP-1 medications (semaglutide and tirzepatide) have several important contraindications. Let us walk through each one.
Absolute contraindications: Do not use
These are medical situations where GLP-1 medications must not be prescribed.
Personal or family history of medullary thyroid carcinoma (MTC)
Medullary thyroid carcinoma is a rare cancer of the thyroid that comes from thyroid cells called C-cells. GLP-1 medications have a “black box” warning from the FDA[1] because animal studies showed an increased risk of MTC when GLP-1s are used long-term at high doses. This warning applies to semaglutide, tirzepatide, and other GLP-1 agonists.
If you or anyone in your immediate family has had medullary thyroid carcinoma, you cannot take a GLP-1 medication.
This applies even if the cancer was many years ago or even if it was successfully treated. The risk of using the medication outweighs any potential benefit for weight loss.
Want to understand the thyroid warning in depth? Read our full explanation of the thyroid cancer black box warning and what the research actually shows.
Personal or family history of Multiple Endocrine Neoplasia syndrome type 2 (MEN 2)
MEN 2 is an inherited genetic condition that increases the risk of medullary thyroid carcinoma and other cancers. People with MEN 2 have an abnormally high lifetime risk of developing thyroid cancer. Because of this elevated baseline risk, combined with the thyroid warning on GLP-1s, these medications are contraindicated if you have or carry the MEN 2 gene.
This is another case where the risk profile is too high, even if the potential weight loss benefit is significant.
Known serious allergic reaction to the medication
If you have had a serious allergic reaction (anaphylaxis, severe rash, angioedema, or severe breathing problems) to semaglutide or tirzepatide, you cannot take that medication. Some people tolerate one GLP-1 better than another, but if you have had a serious allergic reaction to a specific medication, it is absolutely contraindicated.
Pregnancy
GLP-1 medications are not approved by the FDA for use during pregnancy[1]. Animal studies suggested potential risks to the developing baby, though human data is still limited. The FDA label recommends stopping GLP-1 medications at least 2 months before you plan to become pregnant.
If you are already pregnant when you start a GLP-1 medication, you should stop it immediately and contact your provider. Do not abruptly stop taking it yourself unless your provider has told you to do so, but do contact your provider right away to discuss next steps.
If you become pregnant while on a GLP-1 medication, inform your provider as soon as possible so they can evaluate your specific situation and help you transition your care.
Active or severe gastroparesis
Gastroparesis is a condition where the stomach does not empty normally. Food moves through the stomach more slowly than it should, which can cause bloating, nausea, and vomiting. GLP-1 medications work partly by slowing the rate at which food moves from the stomach into the small intestine. In someone with gastroparesis, slowing gastric emptying even further can be dangerous and make symptoms much worse.
If you have been diagnosed with gastroparesis, a GLP-1 medication is not appropriate for you.
Similarly, if you have other severe gastrointestinal motility disorders that affect how your stomach or intestines move food through your system, GLP-1 use requires very careful evaluation or may be contraindicated.
Important relative contraindications and precautions
These conditions require careful provider evaluation. They are not absolute contraindications, but they create meaningful clinical concerns that must be addressed before a prescription is written.
History of pancreatitis
The pancreas produces insulin and digestive enzymes. Pancreatitis is inflammation of the pancreas, and it can be very serious. Some research has suggested a possible link between GLP-1 medications and pancreatitis, though large clinical trials have not shown an increased rate of pancreatitis compared to placebo.
If you have a history of pancreatitis, you are not automatically disqualified from using a GLP-1 medication. But your provider needs to know about it. They will evaluate:
- What caused your pancreatitis (gallstones, alcohol, high triglycerides, or unknown cause)
- How long ago it happened
- Whether you have any ongoing risk factors
- Your current pancreatic function
If you have active pancreatitis right now, you should not take a GLP-1 medication until the pancreatitis resolves. Your provider will guide you on when it is safe to start.
Read more about pancreatitis risk with GLP-1 medications.
Type 1 diabetes
GLP-1 medications are approved for type 2 diabetes and for weight loss in non-diabetic people. They are not indicated for type 1 diabetes, and they do not replace insulin. Type 1 diabetes requires insulin therapy because the pancreas cannot produce it.
If you have type 1 diabetes, you must continue insulin regardless of whether you are on a GLP-1. The two are not interchangeable. Some research has looked at using GLP-1s as an add-on to insulin in type 1 diabetes, but this is not standard practice and carries risks that require specialist (endocrinologist) management. It would not be part of a routine weight loss program.
If you have type 1 diabetes and are interested in weight loss support, talk to your endocrinologist or your primary care provider about what medications or programs are appropriate for your situation.
Personal history of eating disorders
Eating disorders including anorexia and bulimia are serious mental health conditions. GLP-1 medications reduce appetite and can decrease the mental urge to eat. For someone with active or recent eating disorder history, suppressing appetite further could be psychologically harmful and could enable or deepen disordered eating patterns.
If you have a history of eating disorders, your provider needs to know. They may decide that a GLP-1 medication is not appropriate for you, or they may determine it is safe if combined with mental health support. This is a clinical judgment call that requires honest conversation with your provider and possibly with a mental health professional.
Severe kidney disease
GLP-1 medications are not directly toxic to the kidneys, but they are processed and cleared by the body through the kidneys. Patients with severe kidney disease (Stage 4 or 5 chronic kidney disease) may have altered medication clearance. The FDA label does not contraindicate GLP-1 use in kidney disease at standard doses, but your provider will need to evaluate your kidney function carefully and may adjust dosing or monitoring.
Mild to moderate kidney disease is not a contraindication, but it does require provider awareness and evaluation.
History of diabetic retinopathy
Diabetic retinopathy is damage to the blood vessels in the back of the eye (the retina) caused by high blood sugar over time. In people with diabetes who are on GLP-1 medications, there have been rare reports of temporary worsening of retinopathy when blood sugar drops very quickly. This is not a reason to avoid a GLP-1, but it is important information for your provider and your eye doctor.
If you have a history of diabetic retinopathy, tell your provider. They will monitor your blood sugar levels more carefully to avoid dropping them too fast, and your eye doctor may want to check your vision more frequently during the first few months.
Patients taking insulin or insulin secretagogues
If you are already taking insulin or medications in the sulfonylurea family (like glyburide or glipizide, which stimulate the pancreas to produce more insulin), adding a GLP-1 medication increases your risk of low blood sugar (hypoglycemia). This is not a reason to avoid a GLP-1, but it means your other medications need to be adjusted.
Your provider will lower the dose of your insulin or sulfonylurea when starting a GLP-1 to reduce your risk of dangerous low blood sugar episodes. Close monitoring and frequent dose adjustments are essential.
Who qualifies: Eligibility criteria
Even if you do not have any of the contraindications listed above, not everyone qualifies for a GLP-1 program. Eligibility is based on:
BMI and health conditions
The FDA-approved indications for GLP-1 medications for weight loss are[2]:
- Body Mass Index (BMI) of 30 or higher, OR
- BMI of 27 or higher with at least one weight-related medical condition
Weight-related medical conditions include:
- High blood pressure (hypertension)
- Type 2 diabetes
- High cholesterol (dyslipidemia)
- Sleep apnea
- Heart disease or history of heart attack/stroke
- Metabolic conditions related to excess weight
If your BMI is below 27, you would not meet the criteria unless you are being treated for type 2 diabetes specifically.
Provider clinical judgment
Even if your BMI is in range, a provider still has to evaluate your specific health situation and determine whether a GLP-1 medication is clinically appropriate for you. The provider considers:
- Your overall health history
- Your current medications and potential drug interactions
- Your motivation and ability to follow a weight loss program
- Your goals and expectations
- Whether you have any relative contraindications that need careful management
Not all patients with the right BMI will qualify. The provider makes the final decision.
State requirements for live video consultation
Some states have laws requiring a live video consultation (not just an online form) before a prescription can be written. These states are:
- Arkansas (AR)
- District of Columbia (DC)
- Delaware (DE)
- Mississippi (MS)
- New Mexico (NM)
- Rhode Island (RI)
- West Virginia (WV)
If you live in one of these states, you will have a brief video call with the provider as part of the evaluation process. This does not change your eligibility, but it is part of the required process.
What happens next if you qualify
If you do not have any contraindications or relative concerns, and your BMI and health history meet the criteria, you are eligible to move forward with the program.
Here is what happens:
- Complete an online intake form covering your health history, current medications, and weight loss goals.
- An independent, licensed provider reviews your information carefully.
- The provider may request additional information or clarification about your medical history.
- If the provider determines a GLP-1 medication is appropriate, they write a prescription.
- Your prescription is sent to a US-based, licensed compounding pharmacy.
- The pharmacy prepares your medication and ships it to your door.
- You begin the program with regular check-ins with your provider and access to nutrition and fitness coaching.
The entire process from intake to first medication shipment typically takes 5-7 business days.
Questions about your specific situation
This page covers the main contraindications and eligibility criteria. But your health history is unique. If you are unsure whether a condition you have is a contraindication, the right answer is to ask your provider during the intake process.
Be completely honest about:
- Any cancer history (especially thyroid cancer or family history of medullary thyroid carcinoma)
- Any genetic conditions, especially MEN 2
- Stomach or digestion problems, including gastroparesis
- History of pancreatitis
- Kidney or liver disease
- Any eating disorders or history of eating disorders
- All medications you currently take
- Any known allergies to medications
Your provider needs this information to make the right decision. There are no wrong answers – just important ones.
Citations
[1] FDA. “Prescribing Information for semaglutide for chronic weight management.” FDA-approved product labeling. 2021. https://www.accessdata.fda.gov/drugsatfda_docs/label/2021/215256s000lbl.pdf
[2] National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). “Prescription Medications to Treat Overweight and Obesity.” https://www.niddk.nih.gov/health-information/weight-management/prescription-medications-treat-overweight-obesity
Important: Compounded medications are not FDA-approved products. They are prepared by US-based, state-licensed compounding pharmacies and have not been independently evaluated by the FDA for safety, efficacy, or quality. All prescriptions require evaluation by an independent, licensed healthcare provider. Not all patients will qualify. Results vary by individual.