The Rudolph Matas Library has many excellent pharmaceutical resources available electronically.
*MD Consult - Search the "Drugs" tab at the main page
*STAT!Ref - Includes DrugPoints System, Litt's Drug Eruption Reference Manual and USP DI Advice for the Patient. You may search multiple sources simultaneously.
*AHFS DRUG INFORMATION - (in R2 Books) AHFS DI is an unbiased source of drug information and includes evidence-based data.
*Goodman & Gilman's Pharmacology - (in AccessMedicine)
* Meyler's Side Effects of Drugs - (in Science Direct)