Adverse reaction reports describe suspected side effects. A report does not mean the drug caused the event — co-medications, underlying disease and coincidence all contribute.
Is Mometasone Nasal Spray approved in United States?
Yes. FDA has authorised it.
Who is the marketing authorisation holder for Mometasone Nasal Spray in United States?
Washington University School of Medicine is the originator. The local marketing authorisation holder may differ — check the official source linked above.