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Conivaptan inhibits its own metabolism in the body, displaying non-linear pharmacokinetics. About 99% of conivaptan found is bound to human plasma proteins over the range of 10 ng/mL to 1000 ng/mL. The mean half-life of the drug is 5 hours and mean clearance is 15.2 L/hr. [2]
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.
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]
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. Tolvaptan phosphate is converted into the active drug tolvaptan in the human body following administration.
Fischer is going to an opioid addiction treatment clinic. In Fort Collins, a doctor will meet with him for a half hour and write him a prescription for a month’s supply of buprenorphine, a medication that blunts his cravings for heroin and other short-acting opioids. Fischer has spent a dozen or so years dealing with his addiction.
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Vasopressin receptor antagonists include the new class of "vaptan drugs" such as conivaptan, tolvaptan, mozavaptan ... Commons Attribution-ShareAlike 4.0 ...