Metabolism of many pharmaceuticals by human CE occurs through hydrolysis , although some studies have shown that this esterase activity is also inhibited by certain groups of drugs such as antidiuretics and antihyperlipidemics. The interactions of CE activity with pharmaceuticals (hydrolysis and inhibition) are comparable to those described for agrochemicals. It is well known that CE activity detoxifies pesticides through hydrolysis (synthetic pyrethroids) and binding of the pesticide(organophosphate) to the active site of CE.