Both Mounjaro® and Wegovy® use ultra-fine, single-use needles for treatment. While the injection process is similar, the supply method and the specific compatible brands differ between the two medications.

Use this guide to understand:

• The specific needle sizes and gauges compatible with your pen
• Which medications include needles and which require separate supply
• How to obtain replacements and request reimbursement if needles are missing

The Mounjaro® KwikPen® does not come with needles inside the manufacturer’s box; MedExpress supplies these separately within your delivery parcel.

The KwikPen® is designed to work with any ISO 11608-2 compliant pen needles from major brands such as BD, Novo Nordisk, and Terumo. You can safely use any combination of the following lengths and gauges:

Lengths: 4 mm, 5 mm, 6 mm, 8 mm, or 12.7 mm
Gauges: 29G, 30G, 31G, 32G, 33G, or 34G

MedExpress Supply: MedExpress usually provides 5 mm or 6 mm needles with your Mounjaro® order.

Maximum Recommended Length: While the pen is compatible with longer needles, the maximum recommended length for safety and comfort is 8 mm.

You can use different needle lengths with your Mounjaro® pen, as long as they are compatible.

• The pen supports a range of needle lengths
• The maximum recommended needle length is 8 mm
• MedExpress typically supplies 5 mm or 6 mm needles

Longer needles may be suitable for some patients depending on individual factors, but they do not change how the medication works.

If you prefer a different needle length, you can purchase compatible needles from a local pharmacy.

If your Mounjaro® needles were not in your parcel, you have two options:

Request a review:
Your order can be reviewed to confirm whether the needles were missing from delivery.

Purchase locally:
You can buy compatible ISO-compliant needles at most UK pharmacies. Keep your receipt and submit it to MedExpress to receive an account credit of up to £10.

Important:
If the needles were included in your delivery but have since been lost, misplaced, or disposed of, MedExpress will not provide replacements or reimbursement. In these cases, you will need to purchase replacement needles at your own cost.

Unlike Mounjaro®, Wegovy® needles are packed directly inside the box by the manufacturer. Because the box is sealed, MedExpress cannot provide additional or replacement needles for this medication.

The Wegovy® FlexTouch® pen must be used with specific approved needle brands. The maximum recommended needle length is 8 mm. Compatible sizes for these brands include:

NovoFine®: 32G 4mm, 32G 6mm, 31G 6mm, or 30G 8mm
NovoFine® Plus: 32G 4mm
NovoTwist®: 32G 5mm or 30G 8mm
NovoFine® Autocover®: 30G 8mm

If you find that needles are missing from your sealed Wegovy® box:

Purchase locally:
Buy the approved Novo Nordisk brands listed above from a local pharmacy.

Claim credit:
Keep your receipt and submit it to MedExpress. We will apply an account credit of up to £10 to cover the cost.

Important:
If the needles were originally present but have been lost, misplaced, or disposed of after delivery, MedExpress will not provide replacements or reimbursement. You will need to purchase replacement needles at your own cost.

To ensure your treatment remains safe and effective, always follow these sterile injection rules:

One needle per dose:
You must use a fresh, sterile needle for every weekly injection. Never reuse a needle, as this increases the risk of infection and can cause the needle to blunt or block.

Safe disposal:
Used needles must never go into household waste. Place them immediately into a yellow sharps bin after use.

• Wegovy® needles are inside the box, while Mounjaro® needles are supplied separately
• MedExpress usually provides 5 mm or 6 mm needles for Mounjaro®
• The maximum recommended needle length for both pens is 8 mm
• Needle length does not affect how effective the medication is when used correctly
• If needles are confirmed missing on delivery, you can purchase replacements and claim up to £10 in credit
• Lost, misplaced, or discarded needles are not eligible for replacement or reimbursement

If you still need help after reviewing the information above, additional assistance is available.