Tolvaptan is approved for use in -

Tolvaptan is an aquaretic drug that functions as a selective, competitive vasopressin receptor 2 antagonist used to treat hyponatremia associated with congestive hea failure, cirrhosis, and the syndrome of inappropriate antidiuretic hormone . This medication is used to treat low levels of salt (sodium) in the blood, which can result from conditions such as hea failure and ceain hormone imbalances . Tolvaptan improves urine flow without causing the body to lose too much sodium as you urinate. Ref - pubmed.com