Mounjaro Pen Malfunction: Your Dose, Reporting and Replacement Fills
If your Mounjaro pen failed or you can't tell whether the dose went in, don't start a second injection on your own: keep the pen and its carton, report it to Lilly online or at 1-800-545-5979 (9 a.m. to 5 p.m. ET, weekdays), and ask your prescriber or pharmacist how to handle this week's dose. If you already injected again and think you took too much, call your healthcare provider or Poison Help at 1-800-222-1222, or go to the nearest emergency room.
GLP-1s If You're Not Obese or Overweight: What's Approved, What Isn't
No GLP-1 medicine is FDA-approved for weight loss unless you have obesity, or overweight with a weight-related condition. This page shows which approved uses don't depend on weight, what the trials behind the approvals did not test, and the risks of taking one off-label.
GLP-1 vs GLP-2: What Each Hormone Does and Which Drugs Target Them
GLP-1 helps control blood sugar and appetite; GLP-2 helps the gut lining grow. Tirzepatide is not a GLP-2 drug, and as of October 2026 no GLP-2 drug is approved for weight loss.
