Dont ever install epocrates essential because youll be asked to put in password and log in username everyday. And if you are in a hospital building with spotty Internet or cellular connection, then u cant even open the application at all and you might as well delete this application and install skyscape, which is better in this aspect. I understand the need to verify the password during the initial installation process, but to be asked to put in password almost everyday? This is just unnecessary. This is the same thing with other epocrates associated applications such as modalitys procedures consult. Bottom line, insall skyscape or carry a more reliable printed pocket reference over this application.