Risk. The use of electrolytes is not considered to have any environmental impact.
The information comes from Fass.
Fass environmental information
There are several medicinal products with the same information. Presented here is Fass environmental information for Addex-Potassium Chloride (potassium chloride) from Fresenius Kabi (downloaded 2022-05-18).
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.
Author: Health and Medical Care Administration, Region Stockholm