We have never been required to know drugs inside and out from the beginning. If I were you, I would start studying, say, the cardiac drugs by classification:beta blockers, ACE inhibitors, calcium channel blockers, and the other one that I can't remember right now
. Anyhoo, know what they do and how they do it. You may want to find out what type of unit you will be on for your first clinical, and get some idea of the meds commonly used. Like, my first clinical was a telemetry unit, so there were cardiac meds passed, but also diabetic, supplements, stool softeners, anticoagulants. You will have a chance to look up the meds before you give them, and your instructor will probably want to know something like this: Colace is a stool softener that draws liquid into the bowel to make the mass softer and easier to expell. This is being given because the pt is one day post-op and has not passed any stool since 2 days ago. You also don't want to give all the uses of the drug. Like with aspirin, if it's being given as an antiplatelet aggregation med, you won't discuss its ability to lower fever. That's not why the patient is taking it. (You also don't call aspirin a blood thinner-I did that. Don't do that.
Also, as you go along in school, they will probably make you do Pharmacology Data Sheets as part of your clinical paperwork, where you get into all the particulars of your patient's meds.
Oh, hey, I think I remembered: alpha adrenergic blocker!