What semester are your students in? Remeber, to keep their level in the program in mind, when delegating them responsibilities. Hopefully, this is NOT their semester for cardiac rhythms and such
If so, I would consider (for next semester) asking if you could be on a different unit, or with a different level of student.
It's kind of like riding a bike: it will come back to you. You have a great deal of knowledge in your own specialty, so try to find a way to bring that out. Don't be so focused on the tasks you want them to perform, think conceptually. Remember, they need to know how to assess, communicate, solve problems. If you don't know the meds they are giving, look them up yourself! And also, they should be telling you about the meds, you are not waching them! They have the resource (book, PDR, app, etc).
I bet you know more than you think you do, and you definitely know more than them! They can smell fear, so just be confident! Don't use the "I'm not a tele nurse" excuse. It won't give them the reassurance they need, to know that they are going to have a good experience!