Trifluoperazine hydrochloride MCQs With Answer — This concise, student-focused introduction covers key points B. Pharm students must know about Trifluoperazine: a high‑potency, piperazine phenothiazine typical antipsychotic used for schizophrenia and severe psychomotor agitation. Learn essential pharmacology including mechanism of action (D2 receptor antagonism), pharmacokinetics, common and serious adverse effects (extrapyramidal symptoms, tardive dyskinesia, neuroleptic malignant syndrome), monitoring parameters, drug interactions, and safe use in special populations. These targeted MCQs emphasize clinical relevance, dose considerations, toxicity management and formulation differences to build exam confidence and practical knowledge. Now let’s test your knowledge with 50 MCQs on this topic.
Q1. What class of antipsychotic is trifluoperazine hydrochloride?
- Second‑generation antipsychotic
- Butyrophenone derivative
- Phenothiazine (piperazine class)
- Benzodiazepine derivative
Correct Answer: Phenothiazine (piperazine class)
Q2. The primary mechanism of action of trifluoperazine is:
- Serotonin 5-HT2A receptor agonism
- Dopamine D2 receptor antagonism
- GABA-A receptor potentiation
- NMDA receptor blockade
Correct Answer: Dopamine D2 receptor antagonism
Q3. Compared with low‑potency phenothiazines, trifluoperazine is more likely to cause:
- Anticholinergic effects like dry mouth
- Orthostatic hypotension
- Extrapyramidal symptoms (EPS)
- Severe sedation
Correct Answer: Extrapyramidal symptoms (EPS)
Q4. Which of the following adverse effects is most characteristically associated with high‑potency typical antipsychotics like trifluoperazine?
- Weight gain and metabolic syndrome
- Severe anticholinergic delirium
- Acute dystonia and parkinsonism
- Marked sedation
Correct Answer: Acute dystonia and parkinsonism
Q5. Trifluoperazine is contraindicated or should be used cautiously in which condition?
- Parkinson’s disease
- Schizophrenia with psychosis
- Bipolar mania as adjunct
- Severe nausea
Correct Answer: Parkinson’s disease
Q6. A serious, potentially fatal complication of antipsychotics including trifluoperazine is:
- Serotonin syndrome
- Neuroleptic malignant syndrome (NMS)
- Agranulocytosis in all patients
- Severe hypoglycemia
Correct Answer: Neuroleptic malignant syndrome (NMS)
Q7. Which symptom cluster suggests tardive dyskinesia in a patient on long‑term trifluoperazine?
- Acute muscle rigidity and fever
- Involuntary choreoathetoid movements of face and tongue
- Severe drooling and hypotension
- Rapid weight gain and polyphagia
Correct Answer: Involuntary choreoathetoid movements of face and tongue
Q8. The common strategy to manage acute extrapyramidal symptoms due to trifluoperazine is:
- Start a benzodiazepine only
- Give an anticholinergic agent such as trihexyphenidyl or benztropine
- Double the antipsychotic dose
- Start an SSRI
Correct Answer: Give an anticholinergic agent such as trihexyphenidyl or benztropine
Q9. Which lab monitoring is particularly important when initiating or maintaining trifluoperazine therapy?
- Complete blood count to detect agranulocytosis routinely
- Periodic monitoring of fasting glucose and lipids only
- Baseline and periodic assessment of EPS and vital signs; targeted labs as clinically indicated
- Routine liver biopsy
Correct Answer: Baseline and periodic assessment of EPS and vital signs; targeted labs as clinically indicated
Q10. Trifluoperazine’s antiemetic properties are due to blockade of which brain area/receptor?
- H1 histamine receptors in vestibular nucleus
- Dopamine D2 receptors in chemoreceptor trigger zone
- Serotonin 5-HT3 receptors in gut
- Muscarinic receptors in the vomiting center
Correct Answer: Dopamine D2 receptors in chemoreceptor trigger zone
Q11. Which statement about pharmacokinetics of trifluoperazine is correct?
- It is primarily excreted unchanged in urine
- It undergoes extensive hepatic metabolism
- It is not protein bound
- It has negligible oral absorption
Correct Answer: It undergoes extensive hepatic metabolism
Q12. Which receptor blockade contributes most to hyperprolactinemia seen with trifluoperazine?
- Muscarinic M1 blockade
- D2 blockade in tuberoinfundibular pathway
- Alpha-1 adrenergic blockade
- H1 histamine blockade
Correct Answer: D2 blockade in tuberoinfundibular pathway
Q13. Which clinical feature would suggest neuroleptic malignant syndrome rather than simple EPS?
- Intermittent lip smacking
- High fever, severe rigidity, autonomic instability
- Slow tremor relieved by anticholinergics
- Gradual onset of lip and tongue movements
Correct Answer: High fever, severe rigidity, autonomic instability
Q14. Combining trifluoperazine with which drug class increases risk of severe CNS depression?
- SSRIs
- Benzodiazepines and alcohol
- Beta blockers
- NSAIDs
Correct Answer: Benzodiazepines and alcohol
Q15. In elderly patients with dementia‑related psychosis, trifluoperazine use is associated with:
- A decreased risk of stroke
- Increased mortality risk
- Guaranteed improvement without side effects
- No changes in cardiovascular status
Correct Answer: Increased mortality risk
Q16. Which sign indicates acute dystonia as an EPS from trifluoperazine?
- Bradykinesia and masked facies
- Forceful sustained muscle contractions, e.g., torticollis
- Involuntary chewing movements after long treatment
- Gradual onset akathisia
Correct Answer: Forceful sustained muscle contractions, e.g., torticollis
Q17. Which drug interaction increases plasma levels of typical antipsychotics such as trifluoperazine?
- CYP450 inhibitors like fluvoxamine or paroxetine
- CYP450 inducers like rifampicin
- Antacids
- Vitamin supplements
Correct Answer: CYP450 inhibitors like fluvoxamine or paroxetine
Q18. Which adverse effect is least likely with trifluoperazine compared to low‑potency phenothiazines?
- Anticholinergic dryness of mouth
- Acute dystonia
- Parkinsonian rigidity
- Tardive dyskinesia
Correct Answer: Anticholinergic dryness of mouth
Q19. The term “high‑potency” antipsychotic implies:
- Greater affinity for D2 receptors at lower doses
- More anticholinergic and hypotensive effects
- Higher sedation compared to low‑potency agents
- Stronger activity at histamine H1 receptors
Correct Answer: Greater affinity for D2 receptors at lower doses
Q20. When counseling a patient starting trifluoperazine, which advice is appropriate?
- Expect immediate cure of symptoms within hours
- Avoid activities requiring alertness until you know how it affects you
- No monitoring or follow‑up is necessary
- Stop medication abruptly if you feel tired
Correct Answer: Avoid activities requiring alertness until you know how it affects you
Q21. Which cardiac side effect requires caution with trifluoperazine?
- QT interval prolongation and arrhythmia risk
- Immediate myocardial infarction
- Complete immunity to ischemia
- Hyperkalemia-induced conduction block
Correct Answer: QT interval prolongation and arrhythmia risk
Q22. Which of the following is the best description of akathisia?
- Subjective inner restlessness with inability to sit still
- Slow, shuffling gait and stooped posture
- Repetitive oro‑buccal movements after months
- Large involuntary limb movements at rest
Correct Answer: Subjective inner restlessness with inability to sit still
Q23. Trifluoperazine’s effectiveness in treating positive symptoms of schizophrenia is primarily due to blockade of:
- Mesolimbic dopamine pathway
- Mesocortical dopamine pathway
- Tuberoinfundibular dopamine pathway
- Nigrostriatal pathway
Correct Answer: Mesolimbic dopamine pathway
Q24. Which clinical monitoring is essential during an acute NMS event?
- Only mental status, no labs needed
- Temperature, CK levels, renal function, and autonomic signs
- Just lipid profile
- Only fasting glucose
Correct Answer: Temperature, CK levels, renal function, and autonomic signs
Q25. Which symptom suggests anticholinergic toxicity rather than extrapyramidal side effects?
- Severe dry mouth, blurred vision, urinary retention, constipation
- Cogwheel rigidity and tremor
- Acute oculogyric crisis
- Bradykinesia
Correct Answer: Severe dry mouth, blurred vision, urinary retention, constipation
Q26. Which is an appropriate initial step when tardive dyskinesia is suspected in a patient on trifluoperazine?
- Immediately increase trifluoperazine dose
- Discontinue or reduce the offending agent and consider switching to an atypical antipsychotic
- Begin high‑dose anticholinergics indefinitely
- Ignore as it will always resolve spontaneously
Correct Answer: Discontinue or reduce the offending agent and consider switching to an atypical antipsychotic
Q27. Which receptor antagonism contributes to orthostatic hypotension with phenothiazines?
- Muscarinic M2 blockade
- Alpha‑1 adrenergic blockade
- D2 receptor blockade in limbic system
- 5-HT2C blockade
Correct Answer: Alpha‑1 adrenergic blockade
Q28. Which formulation of trifluoperazine is commonly used for rapid control of severe agitation?
- Topical cream
- Immediate‑release oral tablet
- Intramuscular injection
- Nasal spray
Correct Answer: Intramuscular injection
Q29. Which population requires special caution or dose adjustment with trifluoperazine?
- Young healthy adults with no comorbidities
- Elderly patients and those with hepatic impairment
- Patients with seasonal allergies
- Gym athletes
Correct Answer: Elderly patients and those with hepatic impairment
Q30. In pharmacology, trifluoperazine is most accurately described as having which potency and side effect profile?
- Low potency, mainly anticholinergic and sedating
- High potency, more extrapyramidal effects and less sedation
- Equal potency with atypical antipsychotics and no EPS
- No affinity for dopamine receptors
Correct Answer: High potency, more extrapyramidal effects and less sedation
Q31. Which laboratory abnormality can be seen with neuroleptic malignant syndrome from trifluoperazine?
- Markedly elevated serum creatine kinase (CK)
- Low serum potassium only
- Isolated hypernatremia
- Chronic microcytic anemia
Correct Answer: Markedly elevated serum creatine kinase (CK)
Q32. Trifluoperazine’s effect on which neurotransmitter system is associated with improvement in positive psychotic symptoms?
- GABAergic enhancement
- Dopaminergic blockade in mesolimbic pathway
- Enhanced serotonin release
- NMDA receptor activation
Correct Answer: Dopaminergic blockade in mesolimbic pathway
Q33. Which drug class may reduce the efficacy of antipsychotics by inducing hepatic enzymes and lowering plasma levels?
- CYP450 inducers such as carbamazepine and rifampicin
- CYP450 inhibitors such as fluoxetine
- Proton pump inhibitors
- Topical steroids
Correct Answer: CYP450 inducers such as carbamazepine and rifampicin
Q34. For a patient with severe psychosis who is noncompliant with oral meds, a depot formulation alternative is often considered. Does trifluoperazine have a long‑acting depot form widely used?
- Yes, it is commonly available as a long‑acting depot worldwide
- No, trifluoperazine depot formulations are uncommon compared to other antipsychotics
- Only available as a transdermal patch
- Available only as oral syrup
Correct Answer: No, trifluoperazine depot formulations are uncommon compared to other antipsychotics
Q35. Which of the following is a recognized endocrine side effect of D2 antagonists like trifluoperazine?
- Decreased prolactin levels
- Hyperprolactinemia leading to galactorrhea and amenorrhea
- Marked thyroid hormone excess
- Immediate adrenal failure
Correct Answer: Hyperprolactinemia leading to galactorrhea and amenorrhea
Q36. In overdose of trifluoperazine, which management step is recommended?
- Gastric decontamination if appropriate and supportive care, monitor vitals and treat complications
- Immediate dialysis for rapid removal in all cases
- Give large doses of beta‑blockers
- No treatment; it is non‑toxic
Correct Answer: Gastric decontamination if appropriate and supportive care, monitor vitals and treat complications
Q37. Which clinical feature distinguishes pseudoparkinsonism from tardive dyskinesia?
- Pseudoparkinsonism presents with bradykinesia and rigidity; tardive dyskinesia is involuntary choreiform movements
- Both are identical and indistinguishable clinically
- Tardive dyskinesia occurs immediately within hours always
- Pseudoparkinsonism is only seen after decades of therapy
Correct Answer: Pseudoparkinsonism presents with bradykinesia and rigidity; tardive dyskinesia is involuntary choreiform movements
Q38. Which symptom should prompt immediate discontinuation of trifluoperazine and urgent evaluation?
- New mild dry mouth
- High fever with severe muscle rigidity and fluctuating consciousness
- Transient mild headache
- Occasional yawning
Correct Answer: High fever with severe muscle rigidity and fluctuating consciousness
Q39. Which pharmacodynamic action of trifluoperazine may contribute to sexual dysfunction?
- Histamine H1 blockade
- D2 receptor antagonism causing hyperprolactinemia
- Activation of mu opioid receptors
- GABA reuptake inhibition
Correct Answer: D2 receptor antagonism causing hyperprolactinemia
Q40. Which monitoring is recommended when a patient on trifluoperazine develops muscle rigidity and altered mental status?
- CK, renal function, electrolytes, and monitor for NMS
- Only cholesterol levels
- No investigations necessary
- Immediate EEG only
Correct Answer: CK, renal function, electrolytes, and monitor for NMS
Q41. Which statement about use of trifluoperazine in pregnancy is correct?
- It is completely safe and requires no caution
- Use only if benefits justify potential risks; monitor neonate for EPS and withdrawal
- It is absolutely contraindicated in all trimesters
- It enhances fetal growth
Correct Answer: Use only if benefits justify potential risks; monitor neonate for EPS and withdrawal
Q42. What effect does trifluoperazine have on seizure threshold?
- It has no effect on seizure threshold
- It may lower the seizure threshold in susceptible patients
- It raises the seizure threshold markedly
- It cures epilepsy
Correct Answer: It may lower the seizure threshold in susceptible patients
Q43. Which of the following is a reasonable pharmacological alternative when switching from trifluoperazine because of severe EPS?
- Start a higher dose of trifluoperazine
- Switch to an atypical antipsychotic with lower EPS risk such as risperidone or quetiapine
- Add an MAOI antidepressant
- Use only opioids for behavioral control
Correct Answer: Switch to an atypical antipsychotic with lower EPS risk such as risperidone or quetiapine
Q44. Which symptom is most characteristic of anticholinergic side effects from antipsychotics?
- Excessive drooling and sweating
- Dry mouth and constipation
- Bradykinesia and rigidity
- Choreoathetoid movements
Correct Answer: Dry mouth and constipation
Q45. Which statement about dosing strategy for trifluoperazine is appropriate for B. Pharm students to know?
- Always prescribe the maximum dose immediately
- Start at the lowest effective dose and titrate based on response and side effects
- Dosing is irrelevant; one size fits all
- Give only once monthly for all patients
Correct Answer: Start at the lowest effective dose and titrate based on response and side effects
Q46. Which of the following best explains why antipsychotics can cause sexual dysfunction?
- They increase testosterone levels
- Dopamine blockade increases prolactin, suppressing libido and causing sexual dysfunction
- They directly damage peripheral nerves
- They cause permanent penile structural changes
Correct Answer: Dopamine blockade increases prolactin, suppressing libido and causing sexual dysfunction
Q47. Which clinical scale is commonly used for detecting early drug‑induced movement disorders in patients on trifluoperazine?
- APGAR score
- Abnormal Involuntary Movement Scale (AIMS) and Simpson‑Angus Scale for parkinsonism
- Glasgow Coma Scale only
- MMSE for cognitive screening only
Correct Answer: Abnormal Involuntary Movement Scale (AIMS) and Simpson‑Angus Scale for parkinsonism
Q48. Which symptom profile is most consistent with antipsychotic‑induced akathisia?
- Wants to lie still and avoids movement
- Inner restlessness and constant pacing or inability to remain seated
- Gradual tongue movements after many years
- Excessive sleepiness and sedation only
Correct Answer: Inner restlessness and constant pacing or inability to remain seated
Q49. Which medication may be used to treat severe antipsychotic‑induced akathisia?
- Propranolol or benzodiazepines
- High‑dose SSRIs
- High‑dose anticholinergics only
- Metformin
Correct Answer: Propranolol or benzodiazepines
Q50. Which teaching point is important regarding alcohol consumption while on trifluoperazine?
- Alcohol is safe and has no interaction
- Avoid alcohol because it can increase sedation and CNS depression
- Alcohol increases the drug’s elimination so it is beneficial
- Only beer is contraindicated
Correct Answer: Avoid alcohol because it can increase sedation and CNS depression
