Install the Epocrates app from the Google Play*.
When it is finished installing, open the app.
Enter your username and password, or create a new Epocrates account.
Finally, accept the License Agreement.
iOS (iPhone/iPad/iPad mini/iPod touch)
Install the Epocrates Rx free software from the iTunes App Store*.
Enter iTunes user ID and password (which are different from your Epocrates username and password).
Tap on the Epocrates icon from your main home screen.
Enter your Epocrates username and password or create a new one if you do not have one. Then click on "continue installation."
*Note: This app is free. It is not Epocrates Essentials, which requires a paid subscription. There are in-app purchases available.