If you have just been prescribed Fiasp, one of the first practical questions is which pen needles for Fiasp FlexTouch you should buy. The FlexTouch pen does not work without a needle attached, and you will need a fresh one for every injection. This guide covers which needles fit, how to pick a length and gauge, and how many to order so you never run short.
Which Pen Needles Fit Fiasp FlexTouch?
Fiasp FlexTouch is a prefilled, disposable insulin pen made by Novo Nordisk. Like other FlexTouch pens, it has a standard threaded tip, and Novo Nordisk designs it to be used with its own NovoFine Plus and NovoFine pen needles. Most major screw-on pen needle brands, including BD Nano and BD Ultra-Fine, are also made to fit the common pen threading used by FlexTouch and other popular insulin pens.
A few quick points to keep in mind:
- Screw-on needles are the norm. Twist the needle on straight until it is snug. Don't overtighten it.
- Needles are usually bought separately. Check your pharmacy box, but plan on purchasing pen needles on their own.
- Same needles as other FlexTouch pens. If you also use a long-acting FlexTouch pen, the same box of needles usually works for both. See our guide to pen needles for Tresiba FlexTouch.
Best Pen Needle Size for Fiasp FlexTouch
Fiasp is injected under the skin (subcutaneously), so the goal is a needle long enough to reach the fatty layer but short enough to avoid going into muscle. Current injection-technique guidance favors short needles for most adults, which is why 4mm and 5mm needles are now the most common choices.
- 4mm, 32G: The shortest and one of the thinnest options available. Many adults use it without pinching the skin. Our NovoFine Plus 32G 4mm pen needles are a popular match for FlexTouch pens.
- 5mm, 31G: A slightly longer option some people prefer, such as BD Ultra-Fine 31G 5mm.
- 6mm and 8mm: Longer lengths that some people are still prescribed. If you have used them for years, ask your healthcare provider whether a shorter needle makes sense before switching.
Gauge (G) refers to thickness. A higher number means a thinner needle, so 32G is thinner than 31G or 30G.
How Many Pen Needles Do You Need for Fiasp?
Because Fiasp is a mealtime insulin, many people inject it more than once a day, so needles go faster than with a once-daily or once-weekly pen. Use one new needle per injection, plus one for each priming (safety) test if your routine calls for a fresh needle.
A simple way to estimate: multiply your usual number of injections per day by 30. For example, three injections a day works out to about 90 needles a month, so a 100-count box lasts roughly a month. Your actual schedule should come from your healthcare provider, not from this example.
If you go through a box every month, a larger value pack from our pen needle collection can lower your cost per needle and cut down on reorders.
Quick Checklist Before Each Fiasp Injection
- Check the pen label to be sure it is Fiasp and not another insulin.
- Attach a new, sterile pen needle and remove both the outer and inner caps.
- Do a safety test (prime) as described in the pen's instructions for use.
- Inject, then keep the needle in the skin for the time listed in the instructions.
- Remove the needle right away and place it in a sharps container.
FAQ: Pen Needles and Fiasp FlexTouch
Can I use BD needles on Fiasp FlexTouch?
Major BD screw-on pen needles are generally made to fit FlexTouch pens. If a needle doesn't thread on smoothly, stop and try a new one.
Can I leave the needle on between meals?
No. Remove the needle after each injection. Leaving it on can let air in or insulin leak out and may clog the needle.
Do I need a prescription to buy pen needles?
In most US states, you can buy pen needles without a prescription, though some insurance plans require one for coverage.
Specific decisions about needle length, injection sites, and your insulin routine should always follow your healthcare provider's advice.
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