Why did the FDA issue a safety announcement about Xeljanz

Why did the FDA issue a safety announcement about Xeljanz? It's a very complicated question, and it essentially involves the regulatory process for the Food and Drug Administration. In many cases, they will approve of a product and let the product be used by the consumer. In certain cases, they continue to monitor the product for its safety, and they undergo clinical studies. In Xeljanz, the Food and Drug Administration was continuing to monitor, through a clinical trial study, and found out that there are certain problems, such as blood clots, that concerned them enough to issue the alert.

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