Desmopressin is a peptide.
Risk. The use of amino acids, proteins and peptides is not considered to have any environmental impact but see below for further information from Ferring.
This summary information comes from Fass.
Fass environmental information
Fass environmental information for Desmopressin from Ferring (downloaded 2019-06-14).
According to the European Medicines Agency guideline on environmental risk assessments for pharmaceuticals (EMA/CHMP/SWP/4447/00), vitamins, electrolytes, amino acids, peptides, proteins, carbohydrates, lipids proteins, vaccines and herbal medicinal products are exempted because they are unlikely to result in significant risk to the environment.
Even though biomolecules, such as vaccines and hormones, are exempted they should still be regarded as biologically active.
Author: Health and Medical Care Administration, Region Stockholm