Pen vs. vial — what's the difference?

A pen is an injection device; a vial usually means drawing up your prescribed dose with a syringe. Some pens deliver a fixed dose and others need a dose selected. Cost and instructions vary by product. Ask your clinician or pharmacist to show you exactly how to use yours — don’t guess at the amount. KwikPen is a brand name for a pen device, not a separate medication category; instructions depend on the exact product.