Limited information is available on the prevalence of anxiety disorders associated with MA use. In the Shoptaw study cited above, 25% of MA users reported a lifetime prevalence of substance-induced anxiety disorders (Shoptaw et al., 2003). One Australian study reported that 76% of 301 regular amphetamine users reported experiencing severe anxiety and 33% had panic attacks after initiation of MA use (48% reported severe anxiety and 11% had panic attacks before they began MA use; Hall et al., 1996). The NESARC (Conway et al., 2006) described earlier reported a lifetime prevalence for anxiety disorders of 50% among amphetamine users, but the percentage of substance-induced anxiety disorders was not reported.
