A great website that will give you quality pharmacological info...for FREE is www.gsm.com The site is owned by a company by the name of Gold Standard Multimedia. You have to subscribe or register, but it is well worth it. Enjoy 😀
Unfortunately Clinical Pharmacology 2000 (found by linking off the gsm.com website referenced above) is only free for a trial version now <wails horribly!> I used to use that website *constantly*, but they started charging for access earlier this year, even for students. 🙁 It is without a doubt the best Rx database available though, and worth the $$ if you can afford it.