what can cause low sodium
Medications or substances causing Low blood sodium. The following drugs, medications, substances or toxins are some of the possible causes of Low blood sodium as a symptom. This list is incomplete and various other drugs or substances may cause your symptoms (see Low blood sodium). Always advise your doctor of any medications or treatments you are using, including prescription, over-the-counter, supplements, herbal or alternative treatments. 1  Chlorthalidone. 2  Diulo. 3  Metolazone.