The invention relates to methods of and treatments for using pharmaceutical compositions from a class of compounds that directly or indirectly selectively modulates GABAA chloride channel activity to treat alcohol and/or stimulant substance abuse. The present invention also relates to methods of, and protocols for, relieving symptoms associated with alcohol and/or stimulant substance abuse in a comprehensive treatment plan. More specifically, the present invention relates to the use of a selective chloride channel modulator, such as flumazenil, to treat alcohol and/or psychostimulant dependency, the withdrawal symptoms associated therewith, and the cravings associated therewith.