MCCQE Part 1 Psychiatry MCQs: Practice Questions With Explanations

Psychiatry Is MCCQE Part 1's Second-Largest Subject

Psychiatry and behavioural medicine make up a large share of the MCCQE Part 1 question bank, and questions are almost always written as clinical vignettes rather than direct recall of diagnostic manuals. Below are sample vignette-style MCQs grouped by theme, with the correct answer marked and a short explanation.

Psychotic & Mood Disorders

1. Which neurotransmitter pathway is most implicated in the positive symptoms (hallucinations, delusions) of schizophrenia?
A) GABA  B) Dopamine — mesolimbic pathway ✅  C) Serotonin  D) Acetylcholine
Explanation: Excess dopaminergic activity in the mesolimbic pathway is most closely linked to positive psychotic symptoms; the mesocortical pathway is more associated with negative and cognitive symptoms.

2. For a diagnosis of schizophrenia, active-phase psychotic symptoms must be present for at least how long, within a total disturbance of at least 6 months?
A) 2 weeks  B) 1 month ✅  C) 6 months  D) There is no minimum duration
Explanation: The diagnostic criteria require continuous signs of disturbance for at least 6 months, including at least 1 month of active-phase symptoms (or less if successfully treated).

3. A patient has a manic episode lasting over a week with marked functional impairment, alternating with major depressive episodes. What is the diagnosis?
A) Cyclothymic disorder  B) Bipolar I disorder ✅  C) Bipolar II disorder  D) Persistent depressive disorder
Explanation: A full manic episode with marked impairment defines Bipolar I disorder. Bipolar II requires hypomania (a milder, non-impairing elevated mood state), not full mania.

Anxiety & Trauma-Related Disorders

4. A patient has recurrent, unexpected panic attacks followed by a month of persistent worry about having more attacks. What is the most likely diagnosis?
A) Generalized anxiety disorder  B) Panic disorder ✅  C) Specific phobia  D) Illness anxiety disorder
Explanation: Recurrent unexpected panic attacks plus at least a month of anticipatory worry about further attacks or their consequences is the core definition of panic disorder.

Delirium & Cognitive Disorders

5. An elderly patient develops acute confusion and fluctuating attention three days after surgery, resolving over the following week. What is the most likely diagnosis?
A) Alzheimer's dementia  B) Delirium ✅  C) Major depressive disorder  D) Schizophreniform disorder
Explanation: Acute onset and a fluctuating course point to delirium, which is distinguished from dementia's slow, progressive decline in cognition.

Psychopharmacology & Psychiatric Emergencies

6. A patient recently started on a combination of serotonergic medications develops hyperthermia, agitation, clonus, and hyperreflexia over a period of hours. What is the most likely diagnosis?
A) Neuroleptic malignant syndrome  B) Serotonin syndrome ✅  C) Malignant hyperthermia  D) Anticholinergic toxicity
Explanation: Rapid onset after starting or combining serotonergic drugs, with clonus and hyperreflexia, points to serotonin syndrome — distinct from neuroleptic malignant syndrome's slower onset and "lead-pipe" rigidity.

7. A patient on long-term antipsychotic therapy develops fever, generalized muscle rigidity, autonomic instability, and altered mental status over one to three days, with a markedly elevated creatine kinase. What is the most likely diagnosis?
A) Serotonin syndrome  B) Neuroleptic malignant syndrome ✅  C) Acute dystonia  D) Tardive dyskinesia
Explanation: Neuroleptic malignant syndrome develops more gradually than serotonin syndrome and is marked by rigidity, hyperthermia, autonomic instability, and a raised CK.

8. What is the first-line treatment for an antipsychotic-induced acute dystonic reaction (e.g., torticollis, oculogyric crisis)?
A) A benzodiazepine alone  B) An IM/IV anticholinergic such as benztropine ✅  C) Increasing the antipsychotic dose  D) Immediately switching to clozapine
Explanation: Acute dystonic reactions respond quickly to an anticholinergic (or an antihistamine such as diphenhydramine), which is why these are kept on hand wherever antipsychotics are administered.

Keep Practicing

These are just a sample. For the full set of MCCQE Part 1 Psychiatry questions, see HighYield's complete MCCQE Part 1 question bank, or read our MCCQE Part 1 syllabus and pass rate guide for the bigger picture.