The present invention provides isoxazoline FAAH inhibitors of the formula (I): or pharmaceutically acceptable forms thereof, wherein each of G, Ra, Rb, Rc, and Rd are as defined herein. The present invention also provides pharmaceutical compositions comprising a compound of formula (I), or a pharmaceutically acceptable form thereof, and a pharmaceutically acceptable excipient.The present invention also provides methods for treating an FAAH-mediated condition comprising administering a therapeutically effective amount of a compound of formula (I), or pharmaceutically acceptable form thereof, to a subject in need thereof.