Assembling Your Insulin Pen: An Expert Step‑by‑Step Guide

This clinician‑reviewed guide shows you how to assemble a reusable insulin pen safely and confidently. Follow each step closely and consult your healthcare provider for instructions specific to your device and prescription.

What You’ll Need

• Your reusable insulin pen body
• A compatible insulin cartridge (check name and concentration)
• Sterile pen needle (single‑use)
• Alcohol swab and sharps container

Step‑By‑Step Assembly

1. Wash and dry your hands thoroughly.
2. Inspect the insulin cartridge for the correct medication, concentration, and expiry. Do not use if cloudy (unless label indicates suspension) or if particles are present.
3. Insert the cartridge into the pen body as instructed by your model. Ensure it is fully seated and the cap/end is secured.
4. Attach a new sterile needle straight onto the pen. Remove both caps (outer cap saved for later disposal, inner cap discarded).
5. Prime the pen if required by your device: dial a small test dose (e.g., 1–2 units) and press to expel air until a drop appears at the needle tip.
6. Dial your prescribed dose. Double‑check the number on the dose window.

Technique Tips From Clinicians

• Keep the pen vertical when priming to help air rise to the needle.
• Replace the needle after every injection to reduce pain, bending, and infection risk.
• Store insulin per label guidance; avoid extreme temperatures.
• Rotate injection sites to help prevent lipodystrophy.

Troubleshooting

• No drop during priming: repeat priming steps with a fresh needle; check cartridge seating.
• Hard to dial: do not force. Confirm cartridge compatibility and needle fit; replace if damaged.
• Leaking after injection: ensure correct dwell time per instructions before withdrawing the needle.

Safety and Disposal

Always follow your provider’s instructions and local regulations for sharps disposal. Never share pens or needles. If a dose is missed or the pen is dropped, consult your care team.