"Purification Method For Citalopram Or S-Citalopram" in Patent Application Approval Process (USPTO 20240300911).

A patent application by Zhejiang Huahai Pharmaceutical Co. Ltd. describes a purification method for citalopram or S-citalopram, which are commonly used antidepressants. The method involves treating a solution of citalopram or S-citalopram with a washing solution to separate the organic layer containing the desired compound. The washing solution consists of an aqueous solution with a washing agent, such as sulfite or thiosulfate. The method is simple, cost-effective, and efficient in removing impurities. The patent application provides detailed steps and variations of the method. [Extracted from the article]