A. Psychologists are not doctors; psychiatrists are. Psychologists are unable to administer drugs; psychiatrists can. A psychiatrist diagnoses and oversees therapy for patients with complex and significant mental illnesses. Patients receive psychotherapy, or talk treatment, from psychologists. Psychology is a vast field and there are various exciting specialisations one can opt for and make a career in. From Clinical Psychologists to Counsellors to Child Psychology, there are various specialisations one can opt for and excel in.