Tolvaptan tablets can be taken as prescribed from a small dose of 15mg before or after meals, which can be increased to 30mg after 24 hours of administration, and to a maximum of 60mg once a day to elevate serum sodium concentration. Tolvaptan Tablets can increase free water removal and urinary excretion after administration, thus reducing the osmolality of urine, which ultimately makes the serum sodium concentration increase. It is mainly used in the treatment of high volume hyponatremia and other disorders. The drug is usually taken in small doses starting at 15mg, either before or after meals, and does not affect the efficacy of the drug due to eating. However, the dose can only be gradually increased to 30mg after at least 24 hours, and electrolytes need to be checked regularly, and the dose can be increased to a maximum of 60mg according to the serum sodium concentration. Secondly, the drug may cause nausea, dry mouth, excessive urination and other discomforts. And it is contraindicated for those who are allergic to the components of the drug, anuric, hypernatremia. Electrolytes, liver and kidney functions need to be monitored during administration. Pregnant and lactating women should use the drug under medical supervision. All of the above medications should be used under the guidance of a doctor, avoid self-medication to avoid adverse consequences.