Autoinjector

What it means

Zepbound, Mounjaro, Wegovy and Trulicity come in single-dose autoinjector pens. Each pen holds one weekly dose. You remove the cap, place it flat on clean skin, turn the lock ring as the instructions show and press the button. A click starts the injection, and the pen signals when it is done.

There is no dial and no needle to attach, which reduces dosing mistakes. The pen is used once and then thrown away in a sharps container.

Multi-dose pens such as Ozempic, Saxenda and Victoza are different. You attach a new pen needle each time and dial the dose.

Follow the storage rules on your label, including how long a pen can stay out of the refrigerator. If a pen was frozen, dropped hard or the medicine looks cloudy or discolored when it should be clear, ask your pharmacist before using it.

Why it matters

Knowing whether you have a single-dose autoinjector or a multi-dose pen changes how you inject, store and travel with it.