Pharmacology - Alprazolam and half life

[bosch man]

Hi do i get this correctly

if one was to take 1mg xanax (assume the halflife on me is 8 hrs)

in 8hrs it would be 0.5mg

in 16hrs it would be 0.25mg

in 24hrs it would be 0.12mg

and so on all the time halfing until completely gone from blood stream.

If this is correct would i be right in thinking that 16 hours after taking a 1mg tab i would feel the equivilant to asthough i had just taken a 0.25tab?..and so on,if so it would explain why you should never mix with alcohol as even after 24hrs from 1mg you still have the effect of half a 0.25tab.

Correct or totally wrong?

bosch man added 3 Minutes and 29 Seconds later...

...and i assume 1 unit of alcohol clears the blood in approx 1 hour so if one drank 12 units it would take 12 hours to totally clear the system?So its half life is very short.