Hutrope LinePen [somatropin (rDNA origin)] for Injection is a human growth hormone (hGH) produced by recombinant DNA technology. CinnaTropin has 191 amino acid residues and a molecular weight of 22,125 daltons. The amino acid sequence of the product is identical to that of pituitary-derived hGH.

Hutrope LinePen is a sterile liquid intended for subcutaneous administration.

Hutrope LinePen is a highly purified preparation. Biological potency is determined using a cell proliferation bioassay.

Each 10 mg Hutrope LinePen contains 10 mg (approximately 30 IU) somatropin.