Molecule

S2593 

Biological Activity:
Tolvaptan (OPC-41061) is a selective, competitive arginine vasopressin receptor 2 antagonist with an IC50 of 1.28µM for the inhibition of AVP-induced platelet aggregation. Tolvaptan (OPC-41061) is used to treat hyponatremia (low blood sodium levels) associated with congestive heart failure, cirrhosis, and the syndrome of inappropriate antidiuretic hormone (SIADH). Tolvaptan (OPC-41061) is also in fast-track clinical trials for polycystic kidney disease. Treatment with t tolvaptan (OPC-41061) causes rapid and sustained body weight reductions concurrent with increases in urine output, improves and/or normalizes serum sodium in hyponatremic patients, reduces signs and symptoms of congestion and increases thirst. However, tolvaptan (OPC-41061) has not been shown to decrease heart failure re-hospitalization or mortality. As an adjunct to standard therapy, tolvaptan (OPC-41061) is unique in that it is virtually the only novel agent tested in patients hospitalized for acute heart failure syndrome (AHFS) to reach its primary end point for short-term efficacy without causing deleterious side effects. [1][2][3]References on Tolvaptan (OPC-41061)[1] http://en.wikipedia.org/wiki/Tolvaptan, , [2] Eur J Endocrinol. , 2011 Feb 11, [3] Expert Opin Pharmacother., 2011 Apr, 12(6):961-76

T7455 

Biochem/physiol Actions
Tolvaptan (OPC 41061) is a potent, orally active non-peptide vasopressin V2 selective antagonist. IC50 = 3 nM at the rat V2 receptor; 29 times more selective for the V2 than for V1a. Tolvaptan has also been shown to inhibit the development of polycystic kidney disease in several animal models.

T536650 

It is a selective, competitive arginine vasopressin V2 receptor antagonist used to treat hyponatremia (low blood sodium levels) associated with congestive heart failure, cirrhosis, and the syndrome of inappropriate antidiuretic hormone (SIADH).