In my opinion, 0,25 mg alprazolam is not sufficient for the SN protocol. I have a broad experience with benzos and I can say that 0,25 mg is really not a lot. If you haven't tried benzos before, you should try them before you actually plan on doing SN. That way, you'll know what your tolerance level is. I would suggest trying 0,5 mg first, see how you feel. In my SN protocol, I am planning to take at least 10 mg benzos but I have been taking them since 1,5 years so I developed a high tolerance level.