There is a pharmacology audiobook that can help you, I can't post the name because that's advertising, but it's a best seller in "Nursing Pharmacology" on Amazon.com The last poster was right to focus on certain drugs, but it's not true that you can't learn a lot about pharmacology in a few days, the audiobook will teach you much of what you need to know while you are doing other things. The -fil is not the correct ending, it is either -afil for PDE5s like tadalafil, vardenafil, and sildenafil, and the substem in vardenafil and sildenafil is "den" to make -denafil. Here is the drug ending website: Generic Name Stems - Drug Information Portal - U.S. National Library of Medicine Good luck, think you can or think you can't, and you're right.