How long does dalmane (flurazepam) stay in my body?

Dalmane (flurazepam) Dalmane, or flurazepam, has a very long half life (the amount of time it takes for your body to eliminate 1/2 of the amount in your body. Usually 5 half lives are required to totally eliminate a drug from the both. In the case of Dalmane, and if liver and kidney function is normal, it would take 10 days for the drug to be totally out of your bodyl.