Like T said, it will depend on the iu/mg contained. I have a couple of 72iu, but I believe there are 36iu pens as well.

If I'm not mistaken those use a proprietary needle or else Iused the pen to combine diluent and GH, then drew from the pen cartridge with a slin pin, but I may be totally wrong.


As far as instructions for use, Google the term "humatrope pen instructions" and look for the Lilly .PDF.