A psychiatrist is a medical doctor (psychiatry is a medical discipline) A psychologist is a professional with a PhD or EDD, Psy.D
PhD- Doctorate in Philosophy in Psychology
PsyD- Doctorate in Psychology
EDD - Educational Doctorate Degree
A medical doctor (MD, OD) is someone who can write prescriptions.
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Licensed Psychotherapist, Certified Hypnotherapist, Self-Help books author