Our most comprehensive source for drug information is Lexidrug. It contains complete drug monographs, identification, doses, mechanisms of action, interactions, adverse effects, calculators, patient education, and more.
DynaMed offers medication information for each disease or condition, when applicable, and rates the information according to level of evidence.
Embase is a large biomedical and pharmacological literature database. It encompasses everything published in Medline (PubMed), but has content and indexing favoring drug information.