Can you give us more information? Do you have a separate pharmacology practicum or are you preparing for another course's clinical? I certainly won't presume to take the place of your pharm instructor, but I expect my students to know the following information about a medication prior to administration: ordered and normal dosage, route of administration, any preparation (ex- does the medication need to be diluted? If it is IV push, over what time should it be given, etc), what the medication is for, when the medication is ordered, any side effects,does it interact with anything they are taking, and how the student will know the medication is working (or not working). Also, be sure to check your medication rights each time, verify your patient's identification at bedside, identify yourself, wash hands, etc.
Again, I can't speak for other instructors, but students get nervous. I expect them to be able to know the information, but they can look at their cards/drug book/smart phone drug app for guidance. They get nervous and it takes time. As the previous post stated, most instructors don't expect you to memorize it all!
In general for pharm, know the nursing process. Example- what assessment findings might show a need for the medication? What nursing diagnoses might the patient taking this med have? What are your goals for the patient? What interventions are most important? How will you evaluate if the medication is working? Also add in any signs of toxicity and safety issues and patient education.