Most other growth hormones must be refrigerated at all times, but not Norditropin FlexPro® pens.
Store them in the refrigerator at first, but after the first time you use FlexPro®, they can be kept at room temperature (up to 77°F) if you’ll be using them within 21 days. (If you need to keep a pen for up to 4 weeks, store it in the fridge.a) This may allow for greater flexibility without having to preplan refrigeration for pens during overnight visits, vacations—even last-minute trips.