One of the things I'm particularly interested in is trying to clarify the similarities and differences between the practices of a clinical psychologist and a psychiatrist. (It's amazing what different answers I get to this question, from professionals on both sides!) [I'm hoping to avoid a great deal of personal anecdotes about terrible drug-dispensing psychiatrists who don't learn therapy, just for the record!] What I'm asking is more this: imagine that you have two such professionals who each represent all of the best qualities of their fields - they have sought out and studied many forms of psychotherapy, they are great listeners and have wonderful insight, and they do fantastic research. Why might I refer a patient to one versus the other? In what situations would it matter, and in what situations would it not matter? (As one example, my suspician is that it would be totally inappropriate for someone diagnosed with schizophrenia to be treated solely by a psychologist, without ever seeing a psychiatrist - agree or not? Are there other clear examples?)
IMO psychologists and psychiatrists are the only two doctoral level mental health providers and mentally ill patients generally stand to benefit most from being followed by both since each brings a different but complimentary emphasis to diagnosis and treatment, i.e., psych MD/DO the medical and psych PhD/PsyD the cognitive and behavioral. These two perspectives coalesce into the biopsychosocial model of mental healthcare. Furthermore:
1. Similarity: psychiatrists and psychologist can both provide psychotherapeutic interventions (CBT, DBT, REBT, ITP, psychodynamic/psychoanalysis, etc)
2. Difference: psychologists are much more extensively trained to provide psychological assessment (intelligence, academic achievement, adaptive behavior, forensic, interests and aptitude, neuropsychological, personality, psychopathology, etc) and psychological treatments.
3. Difference: psychiatrists are much more extensively trained to provide medical evaluations and medication management.
As far as referring goes, in general I (currently I'm a psychologist but I have just been accepted to med school and intend to become a psychiatrist, actually I intend to become a PsyD, DO) would refer a patient to a psych MD/DO if I was looking to rule out differential diagnosis that are more medical in nature and for psychotropic eval and mgm-especially for more severe psychopathology, treatment resistant cases, and patients with complex comorbid conditions and I would refer to a psych PhD/PsyD if I was looking for assessment of cognitive function limitations, educational issues, intrapsychic and interpersonal patterns and for empirically validated therapeutic interventions, e.g., CBT for Panic Disorder.