RESUMEN
Sodium picosulfate/magnesium citrate (Picolight Powder), which is used as a bowel preparation for the colon and the rectum, can cause a severe electrolyte imbalance like hyponatremia. When hyponatremia gets severe or occurs rapidly, it can lead to death due to associated complications. We have experienced a case of hyponatremia associated with seizure and loss of consciousness in a 76-year-old woman, who took sodium picosulfate/magnesium citrate as a bowel preparation for colonoscopy. She was taking thiazide and synthroid for the treatment of hypertension and hypothyroidism, respectively, and she had other underlying medical conditions such as a history of seizure and dementia. Following the diagnosis of hyponatremia, we used an intravenous injection of 3% NaCl to normalize the sodium level in her serum, and her associated symptoms soon disappeared.