If you can learn the drugs, the actions, the side effects and adverse reactions, you should do well. What helped me was to slip the CD that came with the Davis Drug Guide into the computer and selectively printout the desired info about each drug and highlight what the professor touched on from the lecture. Use dividers to put the drugs into categories. Some people make drug cards. That is a similar technique but I think it's more work. There will be a lot of terminology to learn too. Go through your chapters and make a vocabulary and definition list.
Good luck. I enjoyed pharmacology and did well in the course.