Inhibitors of the soluble epoxide hydrolase (sEH) are provided that incorporate multiple pharmacophores and are useful in the treatment of diseases. In some embodiments, the present invention provides a method for monitoring the activity of a soluble epoxide hydrolase, the method including contacting the soluble epoxide hydrolase with an amount of a compound of the present invention sufficient to produce a detectable change in the fluorescence of the soluble epoxide hydrolase by interacting with one or more tryptophan residues present in the catalytic site of said sEH.