clinicalresources.info

Drug Search via Epocrates Online

Medfacts Natural Products Search via Drugs.com

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Other Resources

Drug Interaction Checker via CVS Caremark
There are a wide variety of drug interaction checkers available on the internet, however, this one from CVS Caremark has a clean interface and is comprehensive, including IV, injectable, PO and OTC drugs, as well as many of the herbs and supplements your patients may be taking on their own.

Drug Effectiveness Review Project, via Oregon Health & Science University
Evidence based evaluations of a wide variety of drug classes and their efficacy for various conditons.