October 23, 20255 min reAd
Semaglutide & Tirzepatide Dosing Guide
weight loss
Article

GLP-1 Injection Measuring Guide: How to Avoid Dosing Errors

If your GLP-1 or GLP-1/GIP medication is provided in a vial (rather than a prefilled pen), accurate measurement is critical. Many injection-related problems are not “medication failures,” but simple measurement errors that can increase side effects and risk.

This guide is not a substitute for your prescription label. Always follow your clinician’s specific dosing instructions.

mg vs mL vs syringe units

Know the three measurement concepts

  • Milligrams (mg): the amount of medication.
  • Milliliters (mL): the volume of liquid.
  • Syringe “units”: a syringe scale that measures volume, not mg.

Your prescription and pharmacy label should connect these safely (for example, dose in mg + the corresponding syringe units for your specific concentration). If you don’t see that mapping, stop and contact your clinician or pharmacy before injecting.

How to confirm your dose mapping

(covered above via prescription + pharmacy label connection)

Safe injection routine

  • Use the syringe and needle type provided or recommended.
  • Measure carefully in good lighting, without distractions.
  • Rotate injection sites as instructed.
  • Keep a weekly schedule and log your injection day/time.

Missed doses and when to contact your clinician

If you miss a dose, do not “double” to catch up. Contact your care team for instructions based on your prescription.

Severe or persistent vomiting, signs of dehydration, severe abdominal pain, or any symptom that feels abnormal warrants medical attention.

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