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Tolvaptan, sold under the brand name Samsca among others, is an aquaretic drug that functions as a selective, competitive vasopressin receptor 2 (V 2) antagonist used to treat hyponatremia (low blood sodium levels) associated with congestive heart failure, cirrhosis, and the syndrome of inappropriate antidiuretic hormone (SIADH).
The "vaptan" drugs act by directly blocking the action of vasopressin at its receptors (V 1A, V 1B and V 2).These receptors have a variety of functions, with the V 1A and V 2 receptors are expressed peripherally and involved in the modulation of blood pressure and kidney function respectively, while the V 1A and V 1B receptors are expressed in the central nervous system.
Conivaptan hydrochloride is an off-white or a pale yellow power with a solubility of 0.25 mg/mL in water at 23 °C. The injectable formulation consists of 20 mg conivaptan hydrochloride, 0.4 g ethanol, 1.2 g propylene glycol and water. [2]
Synthetic aquaretics are vasopressin receptor antagonists and include conivaptan, tolvaptan, demeclocycline, and mozavaptan (OPC-31260), as well as lithium. Conivaptan hydrochloride and tolvaptan have been approved by the FDA for treating syndrome of inappropriate antidiuretic hormone. [4] [5] Mozavaptan is approved in Japan. [citation needed]
Prescription drug list prices in the United States continually are among the highest in the world. [1] [2] The high cost of prescription drugs became a major topic of discussion in the 21st century, leading up to the American health care reform debate of 2009, and received renewed attention in 2015.
Vasopressin infusions are in use for septic shock patients not responding to fluid resuscitation or infusions of catecholamines (e.g., dopamine or norepinephrine) to increase the blood pressure while sparing the use of catecholamines.
Tolvaptan phosphate is a drug used for the treatment of cardiac edema. It is a prodrug of tolvaptan , [ 1 ] [ 2 ] formulated as the salt tolvaptan sodium phosphate, for intravenous administration .
This internalized G s signaling by V 2 R is explained by the receptors ability to form "mega-complexes" consisting of a single V 2 R, β-arrestin, and heterotrimeric G s. [3] The increased intracellular cAMP in the kidney in turn triggers fusion of aquaporin-2 -bearing vesicles with the apical plasma membrane of the collecting duct principal ...
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related to: tolvaptan vs conivaptan 2 gram cost"The lowest prices on generic prescriptions." - The New York Times