Tolvaptan can be taken for polycystic kidney, but may be accompanied by serious adverse reactions. Polycystic kidney, or polycystic kidney disease, is a kind of hereditary cystic changes of chronic kidney disease; it can be divided into autosomal dominant polycystic kidney disease and autosomal recessive polycystic kidney disease; it can be caused by gene mutation, inflammation and other factors; the main symptoms can be seen in the enlargement of the kidneys, low back and abdominal pain and so on. Tolvaptan can assist in the treatment of autosomal dominant polycystic kidney disease and slow down the progression of the disease. The most common adverse reactions of tolvaptan include thirst, fatigue, constipation, polyuria, hyperglycemia, etc.; allergic to the product, suffering from anuria, hypernatremia and other diseases are prohibited; patients suffering from hyperkalemia, hepatic encephalopathy, severe cerebrovascular disease and other patients should be used with caution. If you are suffering from polycystic kidney disease and need to take tolvaptan, you should go to the regular hospital in time, actively cooperate with the doctor’s treatment plan, follow the doctor’s instructions, and do not blindly take the drug on your own.