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Semaglutide safety

A once-weekly GLP-1 medication used for long-term weight management. Review who it's for, who shouldn't take it, and what to watch for — then start your intake to see if it's right for you.

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Semaglutide

semaglutide · GLP-1 receptor agonist

Once-weekly subcutaneous injection or daily oral tablet

Semaglutide is a GLP-1 receptor agonist. It mimics a hormone your gut releases after eating — slowing how quickly your stomach empties, reducing appetite, and helping regulate blood sugar, so you feel full sooner and longer.

Boxed Warning

Thyroid C-cell tumors: In rodent studies, semaglutide caused thyroid tumors, including cancer. It is unknown whether it causes these tumors in humans. Do not use if you or a family member has ever had medullary thyroid carcinoma (MTC) or Multiple Endocrine Neoplasia syndrome type 2 (MEN 2).

What it treats

  • Long-term weight management in adults with obesity (BMI ≥ 30), alongside a reduced-calorie diet and increased physical activity
  • Weight management in adults who are overweight (BMI ≥ 27) and have at least one weight-related condition such as high blood pressure, type 2 diabetes, or high cholesterol
  • Improving blood sugar control in adults with type 2 diabetes

Who shouldn't take it

  • Personal or family history of medullary thyroid carcinoma (MTC)
  • Multiple Endocrine Neoplasia syndrome type 2 (MEN 2)
  • Prior serious allergic reaction to semaglutide or any of its ingredients
  • Pregnancy or planning to become pregnant

Warnings & precautions

  • Pancreatitis — stop use and seek care for severe, persistent abdominal pain
  • Gallbladder problems, including gallstones
  • Low blood sugar (hypoglycemia), especially if combined with insulin or a sulfonylurea
  • Dehydration and acute kidney injury from nausea, vomiting, or diarrhea
  • Possible worsening of diabetic retinopathy
  • Serious allergic reactions

Common side effects

  • Nausea
  • Vomiting
  • Diarrhea or constipation
  • Abdominal pain
  • Fatigue

Call your clinician if you notice

  • Signs of a thyroid tumor (a lump or swelling in the neck, hoarseness, trouble swallowing)
  • Severe stomach pain that won't go away (possible pancreatitis)
  • Symptoms of a serious allergic reaction (swelling, trouble breathing)

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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. A licensed Forma clinician will review your health history and current medications to determine whether treatment is safe and appropriate for you. Never start, stop, or change a prescription without talking to a healthcare provider. If you think you may have a medical emergency, call 911.