Right I've just found this and Dr Eskapa's response is at the bottom, it is a few years old so don't know if anything has changed in the meantime;

viewtopic.php?f=15&t=349

The benzodiazepines will not help you with the Sinclair Method - they will hamper, slow, and weaken your de-addiction or extinction progress. Avoid them if at all possible. There is both scientific research to support this and also clinical cases ....