Study Status: Completed
Recruit Status: Completed
Study Type: Interventional
Official Title: International, Multicenter, Study of One-year, Open-label, Titrated Oral Tolvaptan Tablet Administration in Patients With Chronic Hyponatremia: Extension to Studies 156-02
Brief Summary: This study will assess the safety of long-term tolvaptan use in patients previously enrolled in shorter-term Phase 3 studies and gather information on the natural history of hyponatremia in the context of tolvaptan therapy and underlying disease states.