Who Should NOT Take GLP-1 Medications

GLP-1 medications are remarkably effective, but they're not appropriate for everyone. Some conditions are absolute contraindications. Others require careful consideration and monitoring.

Absolute Contraindications

Do NOT take GLP-1 medications if you have:

🚫 Personal or Family History of Medullary Thyroid Cancer (MTC)

GLP-1 medications caused thyroid C-cell tumors in rodents. While not proven in humans, anyone with MTC or a family history should not take these drugs.

🚫 Multiple Endocrine Neoplasia Syndrome Type 2 (MEN 2)

This genetic syndrome increases thyroid cancer risk. GLP-1 medications are contraindicated.

🚫 Pregnancy

Animal studies show fetal harm. Stop at least 2 months before trying to conceive. If you become pregnant while taking, stop immediately.

🚫 Known Hypersensitivity

If you've had a serious allergic reaction to semaglutide, tirzepatide, or any component, do not take again.

Use With Caution

These conditions require careful consideration and monitoring:

⚠️ History of Pancreatitis

GLP-1s may increase pancreatitis risk. If you've had pancreatitis, discuss carefully with your doctor. Stop immediately if you develop severe abdominal pain.

⚠️ Diabetic Retinopathy

Rapid blood sugar improvement can temporarily worsen diabetic eye disease. Get baseline eye exam; monitor closely.

⚠️ History of Eating Disorders

Appetite-suppressing medications can be triggering. Requires careful psychological support and monitoring.

⚠️ Severe GI Disease

Gastroparesis, inflammatory bowel disease, or severe GERD may be worsened by slowed gut motility.

⚠️ Kidney Disease

Dehydration from GI side effects can worsen kidney function. Close monitoring and hydration are essential.

May Not Be Appropriate

Situations Where GLP-1s May Not Be the Right Choice

BMI under threshold: FDA approval is for BMI ≥30 or BMI ≥27 with comorbidity. Lower BMI = different risk/benefit calculation.
Underweight or malnutrition: Further appetite suppression is dangerous.
Planning surgery soon: Need to stop 1-4 weeks before anesthesia.
Breastfeeding: Unknown if passes into breast milk; not recommended.
Type 1 diabetes: Not approved for T1D; different mechanism.
Children under 12: Limited safety data in pediatric populations.

The Bottom Line

Absolute contraindications: personal/family history of medullary thyroid cancer, MEN 2 syndrome, pregnancy, and known hypersensitivity. Use caution with: history of pancreatitis, diabetic retinopathy, eating disorders, severe GI disease, and kidney disease. May not be appropriate for: those below BMI thresholds, underweight individuals, those planning surgery, breastfeeding mothers, type 1 diabetics, and young children. Always disclose your full medical history to your prescriber.

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