Because Mounjaro pens contain needles, they are classified as “sharps.” Incorrect disposal can pose serious needle-stick injury risks to waste management workers, family members, and pets. Following Food and Drug Administration (FDA) and local guidelines ensures these medical tools are handled safely from the moment you finish your injection.

The disposal process begins immediately after your injection. Follow these steps to ensure maximum safety.

What to do with your Mounjaro pen after you use it

  1. Immediate Containment: Place the used pen into your sharps container right after use. Do not attempt to recap the needle, as this is when most accidental injuries occur.
  2. Proper Labeling: If you are using a household container (like a detergent bottle), clearly label it with a warning that it contains hazardous “sharps” waste.
  3. The Three-Quarters Rule: Do not overfill the container. Once it is about 75% full, seal the lid securely with heavy-duty tape (like duct tape) to prevent it from popping open.
  4. Final Disposal: Check your local community guidelines. Depending on where you live, you may be able to drop the sealed container at a collection site, or you may need to use a mail-back program. Some fire stations, hospitals, or police departments offer designated kiosks for medical waste.

Sharps disposal containers are typically available through:

  • Pharmacies: Many local pharmacies sell FDA-cleared sharps containers.
  • Medical Supply Stores: Both physical and online retailers stock various sizes.
  • Healthcare Providers: Your doctor may provide a container or direct you to a local distribution point.

If an official sharps container is unavailable, you can use a heavy-duty plastic household container, such as an empty laundry detergent bottle. It must be puncture-resistant, able to stand upright, and have a tight-fitting, screw-on lid.

Disclaimer: While Healthline strives for factual, comprehensive, and current information, this article is not a substitute for a licensed healthcare professional’s expertise. Always consult a doctor before taking or discontinuing any medication. Drug information is subject to change and may not cover all uses, directions, precautions, warnings, interactions, reactions, or adverse effects. The lack of a warning does not guarantee a drug’s safety, effectiveness, or appropriateness for all patients or specific uses. Learn more about our approach to content integrity.