Westminster Laboratories

Westminster Laboratories was a specialized British pharmaceutical company primarily recognized for its pioneering work in the standardization of botanical medicines. The company's most significant contribution to healthcare was the development and commercialization of Senokot, a standardized senna-based laxative that became a global standard for treating constipation. Founded in the early 1930s, the firm focused on gastrointestinal health and natural-origin therapeutics, ensuring consistent potency in herbal treatments through scientific rigor. In 1969, the company was acquired by Reckitt & Colman (now Reckitt), which integrated the Senokot brand into its global consumer healthcare portfolio, where it remains a leading product today.