Conivaptan is a medication used to treat hyponatremia, a condition where the body has low levels of sodium. These low levels can cause an imbalance in the body's fluids, leading to symptoms such as weakness, nausea, headache, and seizures. There are no specific synonyms for conivaptan, but there are other medications that can be used to treat hyponatremia, including tolvaptan, demeclocycline, and urea. It is important to speak with a healthcare provider to determine the best treatment for hyponatremia, as the underlying cause of the condition may affect which medication is most effective.