Benzodiazepine withdrawal can occur within hours to days after the last use, depending on the half-life of the particular benzodiazepine used. Short-acting benzodiazepines like alprazolam (Xanax) and lorazepam (Ativan) can cause withdrawal symptoms to appear within a few hours to a day after the last use, while longer-acting benzodiazepines like diazepam (Valium) may take a few days to a week for withdrawal symptoms to begin. However, it’s important to note that benzodiazepine withdrawal can also be delayed for weeks or even months after the last use, especially in cases of long-term use or high doses. Therefore, it’s important to seek medical attention if you are experiencing any withdrawal symptoms after stopping benzodiazepines.