While there are vast differences within these categories and there are books I will review that explain their histories and origins, in a nutshell the main differences between psychiatrists and psychologists are:
Psychiatrists prescribe medicine and their main method of treatment consists of medications and secondarily grossly disabling techniques including electroshock and lobotomy.
—All medications work upon principles of disabling and toxicity—
Psychologists use methods of behavioral treatments that operate upon principles of “sensitization” and “desensitization.”
There are many modalities of “talk therapy,” none of which may be considered “toxic” or “disabling”—except when psychologists serve to uphold The Medical Model and “reify” the diagnosis thus causing “iatrogenesis.”
Psychologists earn “real” doctoral degrees and are true scientists trained in the scientific method. In comparison psychiatrists earn “technical degrees” and are mere technicians.
Psychiatrists are “medical doctors” and are trained in understanding the risks and benefits of medications. The “medical doctor” or “MD” degree has existed for less than a century.
Psychologists are the original “doctors” and have “doctor of philosophy” degrees. The “Ph.D.” has four centuries of heritage.
“Iatrogenesis” is “physician caused illness” and is not limited to the practices of either psychiatrists or psychologists.