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The study evaluated the use of a popular large language model (LLM) to support neurologists in communicating with patients with Multiple Sclerosis. We describe the development of a tailored COSTAR prompt and the process that led to its refinement. A cohort of neurologists assessed the prompt's effectiveness using the QAMAI tool. The results highlight both strengths and the issues that must be addressed for the effective clinical use of LLMs in this context.