No, it is not possible to quickly lower your blood alcohol concentration. If you have been drinking and it has elevated your BAC, you just have to wait for your body to metabolize the alcohol. As it does so, your BAC will naturally decline.
But there are no tricks that can get this to happen more quickly. Eating a meal after you have been drinking does not change how fast the alcohol content works its way out of your system, even though eating before you drink can sometimes delay intoxication. Drinking a cup of coffee can make you feel far more awake because of the caffeine, but it does not actually change your BAC or sober you up.
So how long will it take?
The exact amount of time that it takes for your BAC to get back to zero depends on numerous different factors. It can be different from case to case, and you should never make any assumptions that could put you behind the wheel with an elevated BAC.
That being said, most studies find that it goes down by about 0.015% every hour.
As you can see, this is not a very fast decline. The legal limit for most drivers is a BAC of 0.08%. But this means it could take seven hours for someone at this BAC limit to return to zero.
Plus, it can take time for your BAC to peak. It may not actually reach its peak until 30 minutes to two hours after you stop drinking.
DUI defense options
Many people do not understand how long it takes for their BAC to decline, and they find themselves facing DUI charges. These can lead to a license suspension, jail time, financial fines and other ramifications, so it is very important to know what defense options you have.