the various benzodiazepines. Xanax (alprazolam) and Ativan (lorazepam) are short-acting. Klonopin (clonazepan) and Valium (diazepam) are longer-acting. Jun 3, - Midazolam, lorazepam, diazepam, and phenobarbital are available in Other dosage forms, with a bioavailability of >90 , are assumed to. May 6, - I have a clmt that is being prescribed Xanax, ativan and valium for When I asked the clmt, she indicated that the Xanax and Valium was for everyday panic attacks, and the ativan . valium (diazepam) Thanks for the info.