Safety and Side Effects Despite its promise, Lynozyfic is not without risks. The drug label includes boxed warnings about CRS and immune system overactivation, both of which can be life-threatening if not managed properly. Neurotoxicity, including confusion and seizures, is also a concern, especially in vulnerable patients. Regeneron has committed to rigorous post-market surveillance and is training healthcare providers to recognize and manage these adverse events early. With careful administration and monitoring, many believe the benefits of Lynozyfic far outweigh its risks.