Stephen Stahl’s Essential Psychopharmacology (5th ed., 2021) emphasizes a "circuit-based" approach to mental health, transitioning from simple chemical imbalance theories to complex signal transduction and neural circuitry. The text focuses on precision medicine, using pharmacogenetics and symptom-based prescribing to target malfunctioning brain circuits in schizophrenia, depression, anxiety, and ADHD. For more information, visit the Cambridge University Press website.