How to Use a Semaglutide Pen — UK Step-by-Step Guide (2026)

For laboratory research and in vitro use only. Not for human or veterinary use.

A pre-filled semaglutide Quick Pen arrives already reconstituted at a known concentration and calibrated to a clicks-per-mg card — no bacteriostatic water, no syringe maths. This guide covers every step from unboxing to storage.

1. Unbox and inspect

Pens ship in insulated cold packaging with same-day UK dispatch before 2pm. Check the cartridge window for a clear, colourless solution — no cloudiness or particulates. Keep the clicks-per-mg card with the pen.

2. Clicks, units and mg

On a standard 3mL dial-a-dose pen, one click = 0.01mL = 1 unit on a U-100 scale. A 30mg fill in 3mL gives 10mg/mL, so 1 click = 0.1mg: a 0.25mg dose is 2.5 clicks, 0.5mg is 5 clicks, 1mg is 10 clicks and 2mg is 20 clicks. Verify any custom volume with the peptide reconstitution calculator.

3. Attach a fresh needle

Use a new 32G 6mm screw-on pen needle per dose. Screw it on straight and remove both caps.

4. Prime the pen

Dial 1–2 clicks, hold needle-up, tap out air and press until a bead appears at the tip. Prime a new pen and after each needle change only.

5. Dial and deliver the dose

Dial the clicks from your card, insert at 90°, press the plunger fully and hold for 10 seconds before withdrawing. Recap, unscrew the needle and dispose of it in a sharps bin.

6. How many doses are in a semaglutide pen?

A 30mg pen at 0.25mg weekly holds 120 doses on paper — far more than the solution's usable life. In practice, reconstituted semaglutide should be refrigerated at 2–8°C and used within roughly 4–6 weeks, so plan around that window and step up dose sizes rather than stockpiling.

7. Storage between doses

Refrigerate at 2–8°C with the needle removed and the cap on. Protect from light, never freeze a reconstituted pen and never shake it.

8. Troubleshooting

• No droplet on priming — refit the needle straight and re-prime with 2 more clicks.
• Dial stops short of the dose — not enough solution remains; take the balance from a new pen.
• Cloudy or discoloured solution — stop and contact us with your batch number.
• Leak at the tip — hold for a full 10 seconds before withdrawing.

9. Pen or vial?

Identical peptide, different format. Semaglutide vials are cheaper per mg and let you set your own concentration; pens are ready to dose with calibrated clicks. Both ship with a batch-matched third-party HPLC + MS Certificate of Analysis.