GLP-1 Injection Safety: Common Mistakes and Questions to Ask First

Use the instructions for the exact product in your hand

A prefilled prescription pen and a multi-dose vial do not use the same preparation steps. Even two vials marketed with the same active ingredient may have different concentrations. Follow the official medication guide, pharmacy label, and clinician instructions for that exact product.

Before the first dose, confirm the medication name, prescribed dose, device or syringe, storage requirements, injection schedule, and what to do if a dose is late or missed.

Prevent dosing and handling errors

FDA has received adverse-event reports, including hospitalizations, associated with dosing errors involving compounded injectable semaglutide. Confusion may occur when a prescription is written in milligrams but a patient measures milliliters or syringe units from a concentration they do not fully understand.

• Do not reuse or share needles, pens, or syringes.
• Do not transfer medication between containers unless specifically instructed.
• Rotate recommended injection sites and avoid irritated, bruised, or infected skin.
• Ask before changing the dose because of appetite, side effects, or a plateau.

Know when to stop troubleshooting at home

Contact the prescribing team after a suspected dosing error, repeated vomiting, inability to keep fluids down, significant abdominal pain, signs of an allergic reaction, or other severe or persistent symptoms. Emergency symptoms require emergency care.

This article intentionally does not provide a universal injection tutorial. Safe technique depends on the approved device or the exact dispensed formulation and should be demonstrated by the treating team.