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 Alfacalcidol tablets approved in United States?
Yes. FDA has authorised it.
Who is the marketing authorisation holder for Alfacalcidol tablets in United States?
Chinese SLE Treatment And Research Group is the originator. The local marketing authorisation holder may differ — check the official source linked above.