HowLongDoesXanax Withdrawal Last? The symptoms of Xanax withdrawal typically appear within 8 to 12 hours of your last dose. If you fail to taper your dose, your withdrawal symptoms will grow increasingly intense. HowlongdoesXanaxlast for / stay in your system? One dose of Xanax can last anywhere from 31 hours to 134.5 hours (5.6 days) in the body, depending on factors related to the individual who took it. HowLongDoesXanax Stay in Your Body? Learn how quickly this anti-anxiety drug starts to work, and howlong its effects will last. HowlongdoesXanaxlast? What are the effects of Xanax?Usually, a person with agoraphobia will avoid public places or require a friend or family member to accompany them if they venture out. In extreme situations, they may feel unable to leave home. HowlongdoesXanaxlast? HowLongDoesXanaxLast? Xanax reaches its peak concentration in your body one to two hours after taking it. This means it starts working within an hour after taking the first dose. HowlongdoesXanax take to kick in? Xanax is taken by mouth and absorbed quickly by the bloodstream. Research suggests you may feel the effects of xanax in as little as 30 minutes.Xanax Hangover: What Does It Feel Like and HowLongDoes It Last? If you are wondering howlongXanax stays in your system, here’s a look at what the medication does, howlong it stays in the body, and howlong drug tests can detect it. Have questions about addiction to Xanax? Howlongdoesxanaxlast? Xanax for anxiety and other mental illnesses lasts for up to six hours.2 This type of drug becomes noticeable in the system within about twenty minutes. Howlong your withdrawal from Xanaxlasts will depend on several different factors including how severe their addiction is. Most withdrawal symptoms for Xanaxlast anywhere between 1 week and 4 weeks. Where DoesXanax Go in the Body? Once Xanax enters your bloodstream, it travels to the brain, sets off its calming effects, and eventually gets filtered out by your liver and kidneys. Here’s a closer look at that process: After swallowing Xanax, it’s rapidly absorbed through your small intestine.