Tolvaptan, sold under the brand name Samsca among others, is an aquaretic drug that functions as a selective, competitive vasopressin receptor 2 antagonist. It is used to treat hyponatremia (low sodium levels) associated with conditions such as congestive heart failure, cirrhosis, and the syndrome of inappropriate antidiuretic hormone (SIADH). Tolvaptan helps regulate fluid balance by increasing water excretion without significant loss of electrolytes.
![N-(4-(5-Hydroxy-2,3,4,5-tetrahydro-1H-benzo[b]azepine-1-carbonyl)-3-methylphenyl)-2-methylbenzamide](https://veeprho.com/wp-content/uploads/2022/09/N-4-5-Hydroxy-2-3-4-5-tetrahydro-1H-benzo-b-azepine-1-carbonyl-3-methylphenyl-2-methylbenzamide.png "N-(4-(5-Hydroxy-2,3,4,5-tetrahydro-1H-benzo[b]azepine-1-carbonyl)-3-methylphenyl)-2-methylbenzamide")
Parent: Tolvaptan
![N-(4-(7-Chloro-5-hydroxy-2,3,4,5-tetrahydro-1H-benzo[b]azepine-1-carbonyl)-3-methylphenyl)benzamide](https://veeprho.com/wp-content/uploads/2022/09/N-4-7-Chloro-5-hydroxy-2-3-4-5-tetrahydro-1H-benzo-b-azepine-1-carbonyl-3-methylphenyl-benzamide.png "N-(4-(7-Chloro-5-hydroxy-2,3,4,5-tetrahydro-1H-benzo[b]azepine-1-carbonyl)-3-methylphenyl)benzamide")
Parent: Tolvaptan
![N-(4-(7-chloro-5-methoxy-2,3-dihydro-1H-benzo[b]azepine-1-carbonyl)-3-methylphenyl)-2-methylbenzamide](https://veeprho.com/wp-content/uploads/2022/09/N-4-7-chloro-5-methoxy-2-3-dihydro-1H-benzo-b-azepine-1-carbonyl-3-methylphenyl-2-methylbenzamide.png "N-(4-(7-chloro-5-methoxy-2,3-dihydro-1H-benzo[b]azepine-1-carbonyl)-3-methylphenyl)-2-methylbenzamide")
Parent: Tolvaptan
![N1,N2-bis(4-(7-chloro-5-oxo-2,3,4,5-tetrahydro-1H-benzo[b]azepine-1-carbonyl)-3-methylphenyl)oxalamide](https://veeprho.com/wp-content/uploads/2022/08/N1-N2-bis-4-7-chloro-5-oxo-2-3-4-5-tetrahydro-1H-benzo-b-azepine-1-carbonyl-3-methylphenyl-oxalamide.png "N1,N2-bis(4-(7-chloro-5-oxo-2,3,4,5-tetrahydro-1H-benzo[b]azepine-1-carbonyl)-3-methylphenyl)oxalamide")
Parent: Tolvaptan
Parent: Tolvaptan
![(R)-7-chloro-1-nitroso-2,3,4,5-tetrahydro-1H-benzo[b]azepin-5-ol](https://veeprho.com/wp-content/uploads/2022/08/R-7-chloro-1-nitroso-2-3-4-5-tetrahydro-1H-benz-b-azepin-5-ol.png "(R)-7-chloro-1-nitroso-2,3,4,5-tetrahydro-1H-benzo[b]azepin-5-ol")
Parent: Tolvaptan
![1-(4-Amino-2-methylbenzoyl)-7-chloro-3,4-dihydro-1H-benzo[b]azepin-5(2H)-one](https://veeprho.com/wp-content/uploads/2022/09/1-4-Amino-2-methylbenzoyl-7-chloro-3-4-dihydro-1H-benzo-b-azepin-5-2H-one.png "1-(4-Amino-2-methylbenzoyl)-7-chloro-3,4-dihydro-1H-benzo[b]azepin-5(2H)-one")
Parent: Tolvaptan
Parent: Tolvaptan
Parent: Tolvaptan
![7-chloro-2,3,4,5-tetrahydro-1H-benzo[b]azepin-5-ol](https://veeprho.com/wp-content/uploads/2025/08/VE0025150-7-chloro-2-3-4-5-tetrahydro-1H-benzo-b-azepin-5-ol.png "7-chloro-2,3,4,5-tetrahydro-1H-benzo[b]azepin-5-ol")
Parent: Tolvaptan
During the production and storage of Tolvaptan, related compounds and impurities may form, which must be controlled to ensure the medication’s safety and efficacy. Regulatory authorities establish strict guidelines for monitoring these impurities.
Key aspects of Tolvaptan-related compounds and impurities include:
Advanced analytical techniques, such as High-Performance Liquid Chromatography (HPLC), are employed to detect and quantify Tolvaptan-related compounds and impurities, ensuring compliance with quality standards.
Regular monitoring of liver function is necessary, as Tolvaptan has been associated with liver injury. Adequate hydration is important to prevent dehydration, and patients should avoid grapefruit or grapefruit juice, which can interfere with the drug’s metabolism.
Tolvaptan is typically taken in the morning to allow for diuresis during the day, reducing the risk of nighttime disturbances. Follow your doctor’s instructions on timing for optimal results.
Tolvaptan usually begins to work within a few hours of ingestion by promoting water excretion and increasing serum sodium levels. Its full effect may depend on the condition being treated and individual response.
Tolvaptan should be discontinued if significant liver damage occurs or if the patient experiences severe side effects. Always consult your healthcare provider before stopping the medication.
