panonood
MedicinesComplete User Guide: Manage drug interactions with Stockley's Interactions Checker
Drug to Drug Interaction Checker on Medisafe
PEPID Drug Interaction Checker Update: Alternative Drug Finder
Drugs interactions checker-Software showcase
Epocrates Online-Drug interaction search
Drug Interaction Visualizer
PEPID's Drug Interactions Checker (and preview of soon-to-be-released drug-gene interaction checker)
MedicinesComplete - Stockley's Interactions Checker