The Norditropin Nordiflex pen is a worldwide bestseller and is available in 5mg, 10mg, and 15mg pen formats. There are different presentations of Norditrpoin including FlexPro, NordiFlex, among other presentation names. They come preloaded and use their brand of NovoFine needles, which are provided in sets of 7 free of charge. Norditropin pens can be stored unrefrigerated for up to 4 weeks after first use. The brand Norditropin is a registered trademark of Novo Nordisk Healthcare AG, New Jersey, USA.