Pen Needles for Tresiba FlexTouch: Which Fit and What Size to Buy

If you use a Tresiba FlexTouch pen, you need a fresh pen needle for every injection, and the pen itself doesn't come with them. That leaves a practical question: which pen needles for Tresiba FlexTouch actually fit, what size should you choose, and how many should you order? This guide covers compatibility, sizing, and buying tips so you can pick with confidence.

Which Pen Needles Fit Tresiba FlexTouch?

Tresiba (insulin degludec) is made by Novo Nordisk, and the FlexTouch pen uses a standard threaded tip. That means it works with Novo Nordisk's own screw-on needles, such as NovoFine Plus 32G 4mm pen needles and NovoFine needles, as well as other standard screw-on pen needles, such as BD Ultra-Fine and BD Nano, whose makers list compatibility with major pen brands.

In short, if a needle is labeled as a standard screw-on pen needle compatible with Novo Nordisk pens, it should fit your FlexTouch. If you're ever unsure, check the needle box or the pen's instructions for use.

What Size Pen Needle Is Best for Tresiba?

For most adults, a short needle works well. Widely cited injection-technique guidance says a 4mm pen needle, inserted at 90 degrees, reaches the subcutaneous layer (the fat under the skin) for most people regardless of body size, with less risk of accidentally injecting into muscle.

• 4mm, 32G: The most common choice today. Short and very thin, which many people find more comfortable.
• 5mm or 6mm: Some people prefer these out of habit or on their provider's advice.
• 8mm: Longer. Some people still use it, but many clinicians now suggest shorter lengths for most adults.

Gauge (the "G" number) describes thickness: the higher the number, the thinner the needle. A 32G needle is thinner than a 31G or 30G needle. The right length and technique for you should follow your healthcare provider's recommendation, especially for children or very lean adults.

NovoFine Plus vs BD Nano for a FlexTouch Pen

Both are 32G 4mm needles that fit the FlexTouch, so the choice usually comes down to personal preference and price:

• NovoFine Plus 32G 4mm: Made by the same company as Tresiba. Many users like the smooth feel on a Novo pen.
• BD Nano 2nd Gen 32G 4mm: BD redesigned the needle base on the 2nd Gen to help keep injection depth consistent.

If you're switching brands, a small trial pack is a low-cost way to see which one you prefer before buying a full box.

How Many Pen Needles Do You Need for Tresiba?

Tresiba is a long-acting basal insulin that many people take once a day, but always follow the schedule your provider has set. At one injection per day with a new needle each time, you'll use about 30 needles a month, so a 100-count box lasts a little over three months. If you also use a mealtime insulin pen, count those injections too. Our post on how many pen needles you need per month walks through the math.

Quick Tips for Using Pen Needles With Tresiba FlexTouch

• Attach a new needle right before each injection and remove it after. Don't store the pen with a needle on.
• Do the flow check (safety test) described in your pen's instructions before each injection.
• After pressing the dose button, keep the needle in your skin for the time listed in the instructions so you get the full dose.
• Rotate injection sites to help prevent lumps under the skin.
• Put used needles in an FDA-cleared sharps container or another container your local rules allow.

FAQ

Do NovoFine needles fit Tresiba FlexTouch?
Yes. NovoFine and NovoFine Plus needles are made by Novo Nordisk for its pens, including FlexTouch.

Can I use BD needles on Tresiba?
Yes. BD standard screw-on pen needles, including BD Nano and BD Ultra-Fine, are made to fit major pen brands, including Novo Nordisk pens.

Does the needle size change for U-200 Tresiba?
No. U-100 and U-200 FlexTouch pens use the same screw-on needles. Your dose and pen strength are decisions for your healthcare provider.

Buying Checklist

• Confirm the needle is a standard screw-on type compatible with Novo Nordisk pens.
• Choose your length and gauge (4mm 32G suits most adults).
• Estimate how many you'll use per month and whether a multi-box pack saves you money.
• Buy genuine, factory-sealed boxes from a reputable seller.

You can compare every size and brand we carry in our pen needles collection. Use code WELCOME10 at checkout for 10% off your order. As always, specific decisions about your insulin, dose, and injection technique should follow your healthcare provider's guidance.