Pfizer 36 I U pen

 The Pfizer 36 IU pen refers to the Genotropin GoQuick prefilled pen, a medical device manufactured by Pfizer that delivers 12 mg (equivalent to 36 International Units) of Somatropin. Somatropin is a synthetic, recombinant human growth hormone (rHGH) structurally identical to the natural growth hormone produced by the human body.