In short:
A psychiatrist is a medical doctor who specializes in diagnosing and treating mental health conditions. A psychiatrist can prescribe medication.
A psychologist is not a medical doctor and can’t prescribe medication. Psychologists use treatments and tools like psychological testing to inform strategies for therapy.
A Counsellor is not a medical doctor and can’t prescribe medication. Counsellors tend to adopt a more person-centred approach for therapy.
Therapy takes place over a longer period and tends to delve into various facets of a person and their being.
– PTPC