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 Hydrocortisone hemisuccinate approved in United States?
Yes. FDA has authorised it.
Who is the marketing authorisation holder for Hydrocortisone hemisuccinate in United States?
Association Niçoise de Réanimation Médicale is the originator. The local marketing authorisation holder may differ — check the official source linked above.