(p. 96) Pharmacogenomics and Precision Psychiatry 

Molecular medicine has opened new possibilities of personalized approaches in drug therapy. The development of evidence-based pharmacogenetic guidelines to steer therapy has slowly entered the field of psychiatric therapeutics. Some of the reasons behind the limited progress in psychiatric pharmacogenomics include the broad definition of clinical syndromes, limited knowledge of psychiatric pathophysiology, and limited understanding of psychotropics’ mechanisms of action. Pharmacogenomic markers have been reported for both pharmacodynamic and pharmacokinetic genes. However, only genetic variation in pharmacokinetic genes has shown to be helpful in clinical practice. There is little consensus as to when and if pharmacogenetic tests should be used in psychiatry. There are limited evidence-based dosing guidelines available for actionable gene–drug pairs. Future work in psychiatry may deepen our understanding of the biological underpinnings of psychiatric syndromes and provide the potential for individual tailored therapies.