A family guide to pen needles for Novo Nordisk pens, from FlexPen and FlexTouch insulin pens to Ozempic, Victoza, and Saxenda: which needles fit, what size to choose, and which pens come with needles.

Forteo (teriparatide) pens don't come with needles. Here's which pen needles fit the Forteo pen, what size the instructions point to, and how many to buy for each 28-day pen.

Not every insulin or GLP-1 pen uses separate pen needles. Here's how to tell which injection pens need pen needles, which have a built-in needle, and what to buy.

Thinking about switching pen needle brands because of price, insurance, or availability? Here's what to check on fit, length, gauge, and technique so the change goes smoothly.

Switched to a generic liraglutide pen? Here's how to choose pen needles for generic liraglutide: which types fit, which length and gauge to pick, and how many to keep on hand.

Using a NovoPen Echo reusable insulin pen? Here's which pen needles fit, how to pick a length and gauge, and how many to keep on hand.

Apidra SoloStar doesn't include needles in the box. Here's which pen needles fit it, how to pick a length and gauge, and how to stock up so you never run short at mealtime.

Humulin 70/30 KwikPen does not come with needles. Here is which pen needles fit, how to pick a length and gauge, and how many to keep on hand each month.

Rezvoglar KwikPen doesn't come with needles. Here's which pen needles fit, how to pick the right length and gauge, and how many you'll need each month.

Using a Novolin R, N, or 70/30 FlexPen? Here's which pen needles fit, how to choose a length and gauge, and how many to keep on hand.

Looking for pen needles for Admelog SoloStar? Here's which standard screw-on needles fit, how to pick a length and gauge, and how many to keep on hand.

Using a basal insulin pen, a mealtime pen, and maybe a GLP-1 pen too? Here's how to choose pen needles for multiple pens, keep one box that fits them all, and figure out how many you need.

Not sure which pen needles fit your Fiasp FlexTouch? Here is how compatibility works, which lengths and gauges people commonly choose, and how to figure out how many needles to keep on hand.

Which pen needles fit the Basaglar KwikPen? Learn which needle brands work, how to pick 4mm, 5mm or 6mm sizes, and how many to order each month.

Toujeo SoloStar and Max SoloStar don't come with needles. Here's which pen needles fit, what length and gauge to choose, and how many to order.

Humalog KwikPen doesn't come with needles. Here's which pen needles fit, the best length and gauge for most adults, and how many to buy each month.

Most universal pen needles fit most insulin and GLP-1 pens, but not all of them. Here's how the standard screw-on fit works, which pens don't take separate needles, and how to choose between generic and brand-name options.

Which pen needles fit NovoLog FlexPen? Learn which brands are compatible, the most common length and gauge, how many to buy, and a few FlexPen tips for smoother injections.

Lantus SoloStar pens don't include needles. Here's which pen needles fit, which length and gauge to choose, and how many to keep on hand.