Antipsychotic drugs are important in pharmacology and are frequently studied for B.Pharm, D.Pharm, GPAT, and pharmacist recruitment examinations. Questions commonly cover the classification, mechanism of action, therapeutic uses, adverse effects, and examples of typical and atypical antipsychotics.
In this article, practise 30 important Antipsychotic Drugs MCQs with answers and explanations to strengthen your pharmacology knowledge and prepare for competitive examinations.
📝Antipsychotic Drugs MCQs
1. Which of the following is a first-generation antipsychotic drug?
A. Risperidone
B. Olanzapine
C. Haloperidol
D. Quetiapine
Correct Answer: C. Haloperidol
Explanation: Haloperidol is a first-generation, or typical, antipsychotic that primarily blocks dopamine D2 receptors.
2. Which drug is classified as a second-generation antipsychotic?
A. Chlorpromazine
B. Haloperidol
C. Fluphenazine
D. Risperidone
Correct Answer: D. Risperidone
Explanation: Risperidone is an atypical antipsychotic that acts mainly through dopamine D2 and serotonin 5-HT2A receptor antagonism.
3. What is the primary mechanism of action of most first-generation antipsychotics?
A. Dopamine D2 receptor antagonism
B. GABA-A receptor activation
C. Acetylcholinesterase inhibition
D. Histamine synthesis inhibition
Correct Answer: A. Dopamine D2 receptor antagonism
Explanation: Most first-generation antipsychotics reduce dopaminergic signalling by blocking D2 receptors.
4. Which antipsychotic is commonly associated with a high risk of extrapyramidal symptoms at usual therapeutic exposure?
A. Haloperidol
B. Clozapine
C. Quetiapine
D. Aripiprazole
Correct Answer: A. Haloperidol
Explanation: Haloperidol is a high-potency first-generation antipsychotic associated with extrapyramidal symptoms, including dystonia, akathisia, and drug-induced parkinsonism.
5. Which antipsychotic is particularly associated with agranulocytosis and requires blood monitoring?
A. Chlorpromazine
B. Clozapine
C. Quetiapine
D. Aripiprazole
Correct Answer: B. Clozapine
Explanation: Clozapine can cause severe neutropenia, including agranulocytosis. Blood monitoring according to current prescribing requirements is essential.
6. Which antipsychotic is a dopamine D2 partial agonist?
A. Chlorpromazine
B. Haloperidol
C. Aripiprazole
D. Fluphenazine
Correct Answer: C. Aripiprazole
Explanation: Aripiprazole acts as a partial agonist at dopamine D2 and serotonin 5-HT1A receptors and as an antagonist at 5-HT2A receptors.
7. Chlorpromazine belongs to which chemical class?
A. Phenothiazines
B. Butyrophenones
C. Benzamides
D. Thioxanthenes
Correct Answer: A. Phenothiazines
Explanation: Chlorpromazine is a phenothiazine derivative and a first-generation antipsychotic.
8. Haloperidol belongs to which chemical class?
A. Phenothiazines
B. Butyrophenones
C. Dibenzodiazepines
D. Benzamides
Correct Answer: B. Butyrophenones
Explanation: Haloperidol is a butyrophenone derivative with potent dopamine D2 receptor-blocking activity.
9. Which antipsychotic is particularly associated with weight gain and metabolic adverse effects?
A. Olanzapine
B. Haloperidol
C. Fluphenazine
D. Amisulpride
Correct Answer: A. Olanzapine
Explanation: Olanzapine is associated with weight gain and metabolic changes, including increased blood glucose and lipid abnormalities. Monitoring is important during treatment.
10. Which of the following is a common extrapyramidal adverse effect of antipsychotic drugs?
A. Drug-induced parkinsonism
B. Peptic ulcer
C. Hypothyroidism in every patient
D. Iron-deficiency anaemia
Correct Answer: A. Drug-induced parkinsonism
Explanation: Extrapyramidal symptoms include drug-induced parkinsonism, acute dystonia, akathisia, and tardive dyskinesia.
11. Which antipsychotic is a thioxanthene derivative?
A. Chlorprothixene
B. Clozapine
C. Risperidone
D. Olanzapine
Correct Answer: A. Chlorprothixene
Explanation: Chlorprothixene belongs to the thioxanthene class of first-generation antipsychotics.
12. Which receptor antagonism contributes to the antipsychotic action of risperidone?
A. Dopamine D2 and serotonin 5-HT2A
B. GABA-A and NMDA only
C. Beta-1 and beta-2
D. Muscarinic M2 only
Correct Answer: A. Dopamine D2 and serotonin 5-HT2A
Explanation: Risperidone antagonises dopamine D2 and serotonin 5-HT2A receptors, contributing to its therapeutic effects and adverse-effect profile.
13. Which antipsychotic is commonly associated with increased prolactin levels?
A. Risperidone
B. Aripiprazole
C. Quetiapine
D. Clozapine
Correct Answer: A. Risperidone
Explanation: Risperidone can increase prolactin because of dopamine D2 receptor blockade in the tuberoinfundibular pathway.
14. Neuroleptic malignant syndrome is a serious adverse reaction associated with which drug group?
A. Antipsychotics
B. Antacids
C. Antihistamines only
D. Oral rehydration salts
Correct Answer: A. Antipsychotics
Explanation: Neuroleptic malignant syndrome is a rare but potentially life-threatening reaction characterised by features such as fever, muscle rigidity, altered mental status, and autonomic instability. Suspected cases require emergency medical assessment.
15. Which of the following is a second-generation antipsychotic?
A. Fluphenazine
B. Trifluoperazine
C. Quetiapine
D. Haloperidol
Correct Answer: C. Quetiapine
Explanation: Quetiapine is a second-generation antipsychotic with antagonistic effects at several receptors, including serotonin 5-HT2A and dopamine D2 receptors.
16. Which antipsychotic is particularly known for causing sedation and orthostatic hypotension?
A. Chlorpromazine
B. Aripiprazole
C. Brexpiprazole
D. Cariprazine
Correct Answer: A. Chlorpromazine
Explanation: Chlorpromazine blocks histamine H1 and alpha-1 adrenergic receptors, contributing to sedation and postural hypotension.
17. Which antipsychotic is associated with a comparatively low risk of extrapyramidal symptoms?
A. Clozapine
B. Haloperidol
C. Fluphenazine
D. Trifluoperazine
Correct Answer: A. Clozapine
Explanation: Clozapine generally has a lower risk of extrapyramidal symptoms than many first-generation antipsychotics, although it has other important safety risks.
18. Tardive dyskinesia is best described as:
A. Persistent involuntary movements
B. Sudden loss of hearing
C. Reduced blood haemoglobin
D. Increased urine production
Correct Answer: A. Persistent involuntary movements
Explanation: Tardive dyskinesia is a potentially persistent movement disorder associated with prolonged exposure to dopamine receptor-blocking medicines. It may involve repetitive movements of the tongue, face, or other body parts.
19. Which antipsychotic is commonly used in treatment-resistant schizophrenia under specialist supervision?
A. Clozapine
B. Chlorpromazine only
C. Promethazine
D. Diphenhydramine
Correct Answer: A. Clozapine
Explanation: Clozapine is an important treatment option for treatment-resistant schizophrenia when appropriate treatment trials have not provided adequate benefit.
20. Which of the following is an example of a phenothiazine antipsychotic?
A. Trifluoperazine
B. Aripiprazole
C. Quetiapine
D. Risperidone
Correct Answer: A. Trifluoperazine
Explanation: Trifluoperazine is a first-generation phenothiazine antipsychotic.
21. Which adverse effect is particularly important to monitor with many second-generation antipsychotics?
A. Metabolic abnormalities
B. Severe vitamin C deficiency in every patient
C. Permanent hearing loss in every patient
D. Increased bone length
Correct Answer: A. Metabolic abnormalities
Explanation: Some second-generation antipsychotics can cause weight gain, dyslipidaemia, and impaired glucose regulation. The degree of risk varies by drug.
22. Akathisia is characterised by:
A. Inner restlessness and an urge to move
B. Complete loss of taste
C. Excessive hair growth
D. Reduced bone density in every patient
Correct Answer: A. Inner restlessness and an urge to move
Explanation: Akathisia causes uncomfortable restlessness and difficulty remaining still. It may be mistaken for anxiety or agitation.
23. Which antipsychotic is a dopamine D2 partial agonist and serotonin 5-HT2A antagonist?
A. Aripiprazole
B. Chlorpromazine
C. Haloperidol
D. Fluphenazine
Correct Answer: A. Aripiprazole
Explanation: Aripiprazole’s partial agonist activity at D2 receptors distinguishes it from antipsychotics that act as straightforward D2 antagonists.
24. Which of the following drugs is a first-generation antipsychotic?
A. Perphenazine
B. Lurasidone
C. Olanzapine
D. Paliperidone
Correct Answer: A. Perphenazine
Explanation: Perphenazine is a first-generation antipsychotic belonging to the phenothiazine group.
25. Which receptor blockade contributes to orthostatic hypotension caused by some antipsychotics?
A. Alpha-1 adrenergic receptor blockade
B. Beta-2 receptor activation
C. Insulin receptor activation
D. Nicotinic receptor activation only
Correct Answer: A. Alpha-1 adrenergic receptor blockade
Explanation: Alpha-1 adrenergic receptor blockade can impair the body’s ability to maintain blood pressure when standing, causing dizziness or postural hypotension.
26. Which antipsychotic is a benzisoxazole derivative?
A. Risperidone
B. Chlorpromazine
C. Haloperidol
D. Thioridazine
Correct Answer: A. Risperidone
Explanation: Risperidone is commonly classified as a benzisoxazole derivative and a second-generation antipsychotic.
27. Which of the following is an important safety consideration when prescribing clozapine?
A. Monitoring for severe neutropenia
B. Avoiding all dietary protein
C. Monitoring only hair growth
D. Checking blood glucose is never necessary
Correct Answer: A. Monitoring for severe neutropenia
Explanation: Clozapine can cause severe neutropenia. Required blood-count monitoring and other safety assessments must follow current prescribing guidance.
28. Which antipsychotic is commonly associated with QT interval prolongation and requires attention to cardiac risk?
A. Ziprasidone
B. Vitamin B12
C. Omeprazole
D. Amoxicillin
Correct Answer: A. Ziprasidone
Explanation: Ziprasidone can prolong the QT interval. Cardiac history, interacting medicines, and other risk factors should be considered by the prescribing clinician.
29. Which statement about atypical antipsychotics is correct?
A. They never cause extrapyramidal symptoms
B. They may cause metabolic adverse effects
C. They are all chemically identical
D. They have no clinically important adverse effects
Correct Answer: B. They may cause metabolic adverse effects
Explanation: Second-generation antipsychotics differ in their receptor actions and adverse-effect profiles. Some have significant metabolic risks, and extrapyramidal symptoms can still occur.
30. Which statement about antipsychotic treatment is correct?
A. All antipsychotics have identical adverse effects
B. Patients should stop treatment whenever they feel better
C. Treatment and monitoring should be individualised
D. Monitoring is unnecessary after treatment begins
Correct Answer: C. Treatment and monitoring should be individualised
Explanation: Antipsychotic selection depends on the clinical condition, expected benefits, individual risk factors, tolerability, and response. Patients should not stop or change prescribed treatment without consulting their healthcare professional.
📑Quick Revision: Important Antipsychotic Drugs
- Haloperidol: First-generation antipsychotic; butyrophenone; D2 receptor antagonist.
- Chlorpromazine: First-generation antipsychotic; phenothiazine; may cause sedation and orthostatic hypotension.
- Risperidone: Second-generation antipsychotic; may increase prolactin.
- Olanzapine: Second-generation antipsychotic; notable metabolic and weight-gain risks.
- Clozapine: Important for treatment-resistant schizophrenia; requires blood monitoring.
- Quetiapine: Second-generation antipsychotic; sedation may occur.
- Aripiprazole: Dopamine D2 partial agonist.
- Ziprasidone: Important cardiac safety consideration is QT interval prolongation.
- Akathisia: Inner restlessness and an urge to move.
- Tardive dyskinesia: Involuntary movements that may persist.
📋Frequently Asked Questions (FAQs)
1. Which antipsychotic drugs are important for GPAT and pharmacist exams?
Haloperidol, chlorpromazine, risperidone, olanzapine, clozapine, quetiapine, and aripiprazole are useful examples to study. Focus on classification, receptor actions, therapeutic uses, and adverse effects.
2. What is the difference between typical and atypical antipsychotics?
Typical antipsychotics are first-generation drugs that generally exert their effects mainly through dopamine D2 receptor antagonism. Atypical antipsychotics are second-generation drugs with varied receptor profiles, commonly involving dopamine and serotonin receptors. Their adverse effects differ, and neither group is free from risk.
3. Which antipsychotic requires blood monitoring?
Clozapine requires blood-count monitoring because of the risk of severe neutropenia. Follow the current local prescribing requirements and monitoring protocol.
4. What are extrapyramidal symptoms?
Extrapyramidal symptoms are medication-associated movement disorders that can include acute dystonia, akathisia, drug-induced parkinsonism, and tardive dyskinesia.
🎯 Conclusion
Antipsychotic drugs are an important topic in pharmacology examinations. Revise their classification, mechanisms of action, examples, and characteristic adverse effects regularly. Practising MCQs with explanations can help reinforce concepts and identify topics that need further revision.
Medical disclaimer: This article is for educational purposes only. Antipsychotic medicines require professional assessment and monitoring. Do not start, stop, or change a prescribed medicine without consulting a qualified healthcare professional.
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