Non-adherence to medication is an enormous and poorly quantified problem in medicine and produces its own set of unique challenges in those patients with mental disorders. Failure to adhere to recommended therapy carries a huge burden in terms of cost to healthcare resources, families and society. By its nature it is difficult to measure and often underestimated. This concise, practical text focuses on the problem of non-adherence in patients with schizophrenia and bipolar disorders, reviewing the literature, defining the problem and recommending interventions to enhance adherence. This book is the first text dedicated to this complex problem and will be invaluable for all clinicians and healthcare professionals working with patients with mental disorders.