Yoga
Although the effectiveness of yoga as an intervention for anxiety has been evaluated in a number of studies, the poor quality of the evidence makes it difficult to draw conclusions. Earlier systematic reviews found minimal evidence for the efficacy of meditation therapy [747] or mindfulness-based meditation [748], but two recent systematic reviews concluded that meditative therapies reduced anxiety symptoms [749, 750]. No research has evaluated yoga for people with comorbid anxiety and AOD use.
Dietary supplements
Some people with anxiety disorders may prefer herbal or nutritional supplements, either in addition to, or instead of, psychological or pharmacological therapies. Systematic reviews have found limited evidence for the efficacy of several ‘phytomedicines’, including Passiflora extract, Kava, and combinations of l-lysine and l-arginine [751-753]. Despite its popularity, there is no convincing evidence supporting the use of homeopathy in the treatment of anxiety disorders [754, 755]. Further, none of these supplements have been evaluated among people with comorbid anxiety and AOD use disorders.