A process for the preparation of disodium pamidronate

摘要

A process for the preparation of disodium pamidronate, which process comprises the following steps: a) treatment of an aqueous suspension of pamidronic acid with a sodium hydroxide aqueous solution until obtaining a clear solution; b) filtration of the resulting solution, addition of a solvent and subsequent azeotropical distillation of water; c) cooling of the resulting solution and precipitation of the product. The resulting sodium pamidronate contains water in percentage from 5 to 11%.