A psychiatrist is a qualified medical doctor who then specialised in mental health, and can prescribe medication. A psychologist has trained in psychology rather than medicine, and works chiefly through assessment and talking therapies. The practical difference most people are asking about is prescribing: psychiatrists can, psychologists generally cannot.
The core difference
The words are close because both concern the mind, but the training routes are entirely separate.
Training and scope
- psychiatrist — a medical doctor who completed a medical degree and then specialised in psychiatry. Can diagnose, prescribe medication, and treat the physical dimensions of mental illness.
- psychologist — trained in psychology, usually to doctoral level in clinical practice. Focuses on assessment, psychological testing and talking therapies. In most countries cannot prescribe medication.
Where the words come from
Both take the Greek psyche, mind. The endings do the work: -iatrist comes from iatros, physician — the same element as in paediatrician. -ologist marks a student of a field. So the words themselves encode the split: one is a doctor of the mind, the other a scholar of it.
Related terms
Therapist is broader again and is not a protected title everywhere — it covers a range of trainings. Psychoanalyst refers to a specific therapeutic tradition rather than a qualification level.
This page explains the words. It is not guidance on which professional to consult.
Frequently asked questions
Can a psychologist prescribe medication?
Generally no. Prescribing is a medical function, so it normally sits with psychiatrists. A small number of jurisdictions grant limited prescribing rights to specially trained psychologists.
Is a psychiatrist a real doctor?
Yes. A psychiatrist qualifies in medicine first and then specialises in psychiatry, so they are a medical doctor throughout.
What does the difference in the words mean?
Both begin with the Greek psyche, mind. The ending -iatrist comes from iatros, physician; -ologist marks a student of a subject. The words carry the distinction themselves.