FAAH (Fatty acid amide hydrolase) is a member of the serine hydrolase family of enzymes. FAAH is an integral membrane hydrolase with a single N-terminal transmembrane domain. In vitro, FAAH has esterase and amidase activity. In vivo, FAAH is the principal catabolic enzyme for a class of bioactive lipids called the fatty acid amides (FAAs). Members of the FAAs include: Anandamide,Other N-acylethanolamines,The sleep-inducing lipid oleamide,The N-acyltaurines.Studies in cells and animals and genetic studies in humans have shown that inhibiting FAAH may be a useful strategy to treat anxiety disorders.