Uses in organic livestock production: Allowed as a medical treatment. Acts as an anticonvulsant, laxative, bronchodilator, electrolyte replacement aid with hypomagnesaemia, and may be used to treat cardiac arrhythmias. Used to treat lactation tetany or grass tetany which occurs when ruminants graze on grasses low in magnesium or suffer from a low level of magnesium in their diet. In swine, used to treat malignant hypothermia. Also used to treat inflammation and abscesses in livestock by soaking affected area in magnesium sulfate solution.
Reference on the National List: §205.603(a) As disinfectants, sanitizer, and medical treatments as applicable. (15) Magnesium sulfate.