What is the best benzo to use long term for severe anxiety?

Benzo = Short-term: All antidepressants, but particularly the ssris may be better for long term use since the older anti-anxiety drugs (benzodiazepines, such as valium, Ativan and xanax (alprazolam) carry a risk of addiction or tolerance, thus not being as desirable. All have possible side effects, and i strongly recommend cbt therapy to learn skills to reduce or avoid drug tx. Good luck.