Often times, you will have a choice of a PO emergency med and an IM of the same med.
So, the goal is to attempt to have the pt take the PO first, then if that fails, you go with the IM.
Better to try and get the PO before things get too out-of-hand than having to do an IM, because usually by that time that means the pt has possibly escalated to the point of needing to be held down by staff... we like to try to avoid that.
In fact, good staff will do everything they can to try to redirect a pt to avoid having to use any emergency meds.
We use a lot of Haldol and Ativan. They can be given together in a single syringe-- hence it's known as "the cocktail".
If you haven't figured it out already, if you want to reply to a specific post, hit the "quote" button and then type your response. It avoids confusion, making it clear who you are responding to.
Good luck with your interview!
Psych is awesome.