You're being down-voted, but I know a number of military medics and hospital employees who do this after heavy drinking. Seems to work like a charm.
Wasn't there a scene in Hangover (the movie) where this was offered as service in Las Vegas?
There appears to be a scene in reality where someone is doing this, too: https://www.theivdoc.com/ ("Food Poisoning Relief")
The salts work great for normal hangovers though.
It's offered as a service in Denver - IIRC the ads are focused on helping you feel better when you're low on energy or whatever, but I know people who have gone for hangovers.
When I was in the army we did this regularly. My barracks roommate was our platoon medic and would stockpile as many IV bags as he could without causing suspicion. Anytime we had a late night of heavy drinking, before morning PT he’d hook up a bag and 20 minutes later we’d be feeling great and good to go,.
Which makes me always wonder: IV carries always the risk of thrombosis so I'd expect especially medical personnel staying away from it. But maybe they take also good dose of Warfarin with it...
IVs don't really carry a meaningful risk of systemic thrombosis, so taking warfarin would not put you in a good place on the cost/benefit axis.
Good friend of mine was a psych nurse. Can confirm from his stories.