Haloperidol not FDA approved for IV use. Flush line with saline to prevent precipitation with Heparin and Phenytoin. Haloperidol can be given through IV drip. Edited Stoudemire A, Fogel BS, APPI 1993. Typical high potency side effects such as EPS, dystonic reactions, akathisia are rare with IV use.
Hypotension is a rare side effect.
Droperidol has FDA approval for IV anesthetic use. Dose 2.5 -5 mg, followed by additional increments of 1.25 mg to 5 mg until agitation is controlled. Santos 1993 Emergency Room, Psychiatry Ward, General Hospital Sedation of the Agitated Patient. Here IV access is much more difficult to obtain and maintain until agitation is under control. Will need to use IM or concentrate route.