Abstract
Tolvaptan is an orally administered, nonpeptide, selective arginine vasopressin V1 receptor antagonist that increases free water clearance, thereby correcting low serum sodium levels.
SALT-1 and -2, two identical, randomized, double-blind, placebo-controlled, multicentre trials, included patients with hypervolaemic or euvolaemic hyponatraemia (serum sodium <135 mmol/L) associated with heart failure, cirrhosis or the syndrome of inappropriate antidiuretic hormone secretion. In both trials, patients receiving (in addition to standard medical treatment) tolvaptan 15–60 mg once daily (titrated according to response) for up to 30 days (n=95 and 118) experienced significantly greater improvements than those receiving placebo (n = 89 and 114) for the co-primary endpoints of the change in average daily area under the curve for the serum sodium level from baseline to day 4 and from baseline to day 30.
This beneficial effect of tolvaptan on serum sodium levels in SALT-1 and -2 was observed in patients with mild (serum sodium <135 mmol/L) and in those with marked (serum sodium <130 mmol/L) hyponatraemia at baseline.
Tolvaptan was also superior to placebo in increasing serum sodium levels from baseline to day 7 in a subgroup of 323 patients with hyponatraemia (serum sodium <134 mmol/L) in the randomized, double-blind, multicentre EVEREST trials, which included patients who were hospitalized for worsening heart failure.
Tolvaptan was generally well tolerated in clinical trials. The most frequently reported adverse events were thirst and dry mouth, which result from the pharmacodynamic effects of the drug.
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Acknowledgements and Disclosures
The manuscript was reviewed by: J.E.A. Blair, Northwestern University, Feinberg School of Medicine, Chicago, Illinois, USA; J.K. Ghali, Department of Cardiology, Detroit Receiving Hospital, Cardiovascular Clinical Trials Program DMC Cardiovascular Institute, Department of Medicine, Wayne State University, Detroit, Michigan, USA.
The preparation of this review was not supported by any external funding. During the peer review process, the manufacturer of the agent under review was offered an opportunity to comment on the article. Changes based on any comments received were made on the basis of scientific and editorial merit.
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Plosker, G.L. Tolvaptan. Drugs 70, 443–454 (2010). https://doi.org/10.2165/11204630-000000000-00000
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DOI: https://doi.org/10.2165/11204630-000000000-00000