AA has a 'singleness of purpose' Alcohol/Alcoholics/Alcoholism.
The definition of the term 'sober,' according to AA (the organization, not individual AA members) is...........: 'Freedom from alcohol.' There's no mention of any other drugs, legal or illegal (these would be considered outside issues).
Therefore, if a person was taking any drugs (prescribed or street) besides alcohol, and was not on alcohol, that person would be considered sober, according to AA.
(o:
NoelleR