A series of phenyl 4-[(indol-1-yl)alkyl]piperidine carbamates was synthesized and tested for inhibition of the endocannabinoid degrading enzyme fattyacidamidehydrolase (FAAH) and for metabolicstability in rat liver S9 fractions and porcine blood plasma. Structure–activity relationship studies revealed that variation of the length of the alkyl spacer connecting the indole and the piperidine heterocycle