I first had this on my Palm Pilot@! – epocrates Review

1) it is Free! But it is an excellent resource. I use it in my work, case management for individuals with serious mental illnesses and long hx’s of numerous medications. The ability to get a quick picture of med interactions helps in advising clients in looking at choices. I also use it in my personal life—it also has the Oregon Health plan formulary—an extra plus!! I highly recommend it (and often do, with work peers and other service providers. Did I say that there is a free version?
Review by Lin Biao on epocrates.