Xanax (alprazolam) and diazepam are benzodiazepines used for anxiety, but they work differently. Xanax is fast-acting with a shorter duration, making it effective for sudden or intense anxiety episodes. Diazepam also works quickly but lasts much longer in the body, which can provide more sustained calming effects. Xanax is generally considered stronger milligram-for-milligram, but that does not mean it is the better choice for every patient. Diazepam’s longer action may suit ongoing anxiety or muscle tension. Both carry risks of dependence, sedation, and withdrawal. The safest option depends on individual needs and should be determined by a healthcare professional.