How long does Restoril stay in your system?

Detectable levels of temazepam, which is sold under the brand name Restoril, remain in a person's system for a few days to three months, according to About.com. The exact amount of time varies based on the kind of drug test being administered.

Restoril is detectable in someone’s urine for up to six weeks, in his blood for up to 48 hours, in his saliva for up to 10 days and in his hair for up to 90 days, About.com notes. Factors that determine how long Restoril remains detectable include one’s metabolism, age, weight, pre-existing health conditions, physical activity and hydration levels.