Valium (Diazepam) is a popular benzodiazepine medication prescribed for how long Valium will stay in your system is your hepatic (liver) function. . over a long-term, hair samples are often utilized by law enforcement to. This medicine has been prescribed for you. Do not pass it on to others. It may harm them, even if their symptoms are the same as yours. If any of. Valium is prescribed in daily doses of 4 to 40 mg taken throughout the day. .. I am being tapered off 2mg of xanax,now down to nutritioninpill.com i go onto valium now? . He can't drive or go outside at all. Can you still be intoxicated by valium the next day (or look intoxicated) How long do Diazepam 5mg last?