How long will alprazolam (xanax) take to work?

Xanax (alprazolam) fast action. Xanax, (alprazolam) klonopin, valium, serax, Librium are part of what is called the class of benzodiazepines. Some are fast acting and short acting as xanax= it works within 15mn and its effects on last a few hours. Valium is take hours to work and works for days. Addicts prefer fast acting meds (they cannot wait for hours for a med to work) but all benzos can be addictive. Never use any benzo more than 3mo.