Psychopharmacology Practice Questions

Q: Which of the following drugs is the first-line treatment for Tourette's syndrome?

Haloperidol. **Explanation:** **Tourette’s Syndrome (TS)** is a neurodevelopmental disorder characterized by multiple motor and vocal tics. The pathophysiology is primarily linked to **dopaminergic overactivity** in the basal ganglia. Therefore, dopamine (D2) receptor antagonists are the mainstay of pharmacological treatment. **Why Haloperidol is correct:** **Haloperidol**, a high-potency typical antipsychotic, is the traditional **first-line drug** and the first FDA-approved medication for Tourette’s syndrome. It works by potently blocking D2 receptors, effectively reducing the frequency and severity of tics. While newer agents are often used in clinical practice to avoid side effects, Haloperidol remains the classic textbook answer and the gold standard for competitive exams like NEET-PG. **Why other options are incorrect:** * **Chlorpromazine:** A low-potency typical antipsychotic. While it blocks D2 receptors, its significant sedative and anticholinergic side effects make it less suitable for the long-term management of tics compared to Haloperidol. * **Olanzapine & Risperidone:** These are atypical antipsychotics. While **Risperidone** is frequently used "off-label" and is often preferred in modern clinical practice due to a lower risk of Extrapyramidal Symptoms (EPS), Haloperidol remains the established first-line reference in standard pharmacological hierarchy for TS. **High-Yield Clinical Pearls for NEET-PG:** * **Pimozide:** Another high-potency typical antipsychotic specifically indicated for TS when Haloperidol fails or causes intolerable side effects. * **Alpha-2 Agonists:** Drugs like **Clonidine** and **Guanfacine** are often preferred as initial therapy if the patient has comorbid ADHD. * **Side Effects:** When using Haloperidol, monitor for **Extrapyramidal Symptoms (EPS)** such as dystonia, akathisia, and tardive dyskinesia.

Q: Which of the following psychiatric disorders, apart from depression, are selectively treated with serotonin reuptake inhibitors?

All of the above. Selective Serotonin Reuptake Inhibitors (SSRIs) are the first-line pharmacological treatment for a wide spectrum of psychiatric conditions beyond Major Depressive Disorder. Their primary mechanism involves inhibiting the presynaptic reuptake of serotonin (5-HT), thereby increasing its availability in the synaptic cleft and modulating downstream neural circuits involved in anxiety and impulse control. **Explanation of Options:** * **Obsessive-Compulsive Disorder (OCD):** SSRIs (e.g., Fluoxetine, Fluvoxamine, Sertraline) are the gold standard treatment. They typically require higher doses and a longer duration (10–12 weeks) to show efficacy compared to depression. * **Phobias:** SSRIs are highly effective for **Social Anxiety Disorder (Social Phobia)** and Panic Disorder with or without agoraphobia. They help desensitize the "fear circuitry" in the amygdala. * **Post-Traumatic Stress Disorder (PTSD):** SSRIs (specifically Sertraline and Paroxetine) are FDA-approved first-line agents that help manage the core symptoms of re-experiencing, avoidance, and hyperarousal. Since SSRIs are the treatment of choice for all three conditions, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **DOC (Drug of Choice):** SSRIs are the DOC for OCD, PTSD, Panic Disorder, Social Phobia, GAD, and Premenstrual Dysphoric Disorder (PMDD). * **OCD Exception:** While SSRIs are first-line, **Clomipramine** (a TCA) is the most potent drug for OCD but is reserved for second-line due to its side-effect profile. * **Side Effects:** Remember the "S" mnemonic: **S**exual dysfunction (most common long-term side effect), **S**leep disturbances, and **S**tomach upset (nausea/diarrhea). * **Fluoxetine** has the longest half-life, making it least likely to cause withdrawal symptoms.

Q: A patient in the emergency department exhibits psychosis. Pharmacological intervention to decrease psychosis would most likely involve which of the following mechanisms?

Blockade of dopaminergic neurotransmission. ### Explanation **1. Why Option A is Correct:** The primary pharmacological management of psychosis is based on the **Dopamine Hypothesis of Schizophrenia**. This hypothesis suggests that psychosis results from overactivity of dopaminergic neurons in the **mesolimbic pathway** of the brain. Antipsychotic drugs (Neuroleptics) work by blocking postsynaptic **D2 receptors**, thereby reducing dopaminergic neurotransmission. Both typical (e.g., Haloperidol) and atypical antipsychotics (e.g., Risperidone) share this fundamental mechanism of D2 receptor antagonism to alleviate positive symptoms like hallucinations and delusions. **2. Why Other Options are Incorrect:** * **Option B:** Stimulating dopaminergic neurotransmission (e.g., using Levodopa or Amphetamines) actually **induces or worsens** psychosis. This is a common side effect seen in Parkinson’s patients treated with dopamine agonists. * **Options C & D:** Nitrergic neurotransmission involves Nitric Oxide (NO). While research is ongoing regarding the role of NO in NMDA receptor signaling and its potential link to schizophrenia, it is **not** the established target for standard emergency pharmacological intervention in psychosis. **3. NEET-PG High-Yield Pearls:** * **Mesolimbic Pathway:** Blockade here leads to the **therapeutic effect** (reduction of positive symptoms). * **Nigrostriatal Pathway:** Blockade here leads to **Extrapyramidal Side Effects (EPS)** like dystonia and parkinsonism. * **Tuberoinfundibular Pathway:** Blockade here leads to **Hyperprolactinemia** (galactorrhea, gynecomastia). * **Mesocortical Pathway:** Low dopamine here is linked to **negative symptoms** (apathy, withdrawal); traditional blockers may worsen these. * **Atypical Antipsychotics:** These also block **5-HT2A receptors**, which helps reduce EPS and improve negative symptoms.

Q: A 23-year-old male with schizophrenia, currently maintained on risperidone for 2 months, has no family history of the disease. For how long should the medication be continued?

2 years. **Explanation:** The duration of maintenance therapy in schizophrenia is primarily determined by the number of psychotic episodes and the risk of relapse. 1. **Why Option C (2 years) is correct:** According to standard psychiatric guidelines (APA and Maudsley), for a patient experiencing their **first episode of schizophrenia** who has achieved clinical remission, maintenance treatment with antipsychotics should be continued for **1 to 2 years**. This period is crucial to prevent relapse and ensure neuronal stabilization. Since the patient is 23 years old and there is no mention of prior episodes, this is treated as a first-episode case, making 2 years the most appropriate choice among the options. 2. **Why other options are incorrect:** * **Option B (6 months):** This duration is typically reserved for a "Brief Psychotic Disorder" or the initial stabilization phase, but it is insufficient for Schizophrenia, where the risk of relapse is high. * **Option D (12 months):** While some guidelines suggest 1 year, most competitive exams and clinical standards prefer the 2-year mark for a first episode to ensure long-term stability. * **Option A (5 years):** This duration is indicated for patients who have had **multiple episodes** (recurrent schizophrenia) or those with a history of violent behavior or severe relapses. **High-Yield Clinical Pearls for NEET-PG:** * **First Episode:** 1–2 years of maintenance. * **Second/Multiple Episodes:** At least 5 years of maintenance. * **Chronic/Severe Relapses:** May require lifelong treatment. * **Risk of Relapse:** Approximately 80% of patients relapse within 5 years if medication is discontinued prematurely. * **Risperidone:** An atypical antipsychotic; monitor for hyperprolactinemia and extrapyramidal symptoms (EPS) at higher doses.

Q: What is the most accurate treatment for erectile dysfunction?

Sildenafil. **Explanation:** **Erectile Dysfunction (ED)** is defined as the persistent inability to attain or maintain a penile erection sufficient for satisfactory sexual performance. **Why Sildenafil is correct:** Sildenafil is a selective **Phosphodiesterase-5 (PDE-5) inhibitor**. It works by inhibiting the enzyme PDE-5, which normally breaks down cyclic Guanosine Monophosphate (cGMP) in the corpus cavernosum. By preventing cGMP degradation, it enhances nitric oxide-mediated smooth muscle relaxation and increases blood flow to the penis. It is currently the **first-line pharmacological treatment** for ED due to its high efficacy and oral route of administration. **Analysis of Incorrect Options:** * **Master and Johnson technique:** This refers to behavioral therapy (e.g., "sensate focus" exercises). While useful for psychogenic sexual dysfunction or premature ejaculation, it is not the primary or most accurate treatment for organic ED. * **Beta-blockers:** These are actually a **cause** of erectile dysfunction (a known side effect), not a treatment. * **Papaverine:** This is a vasodilator that can be used via intracavernosal injection. While effective, it is considered a second-line treatment due to the risk of priapism and the invasive nature of administration compared to oral PDE-5 inhibitors. **High-Yield Clinical Pearls for NEET-PG:** * **Contraindication:** Sildenafil must **never** be co-administered with **Nitrates** (e.g., Nitroglycerin), as it can lead to life-threatening hypotension. * **Side Effects:** Common side effects include headache, flushing, and **cyanopsia** (blue-tinted vision) due to cross-reactivity with PDE-6 in the retina. * **Tadalafil vs. Sildenafil:** Tadalafil has a much longer half-life (approx. 17.5 hours) compared to Sildenafil (4 hours), earning it the nickname "the weekend pill."

Q: Which of the following drugs requires serum level monitoring?

Lithium. **Explanation:** **Lithium** is the correct answer because it has a **narrow therapeutic index**, meaning the difference between a therapeutic dose and a toxic dose is very small. Therapeutic drug monitoring (TDM) is mandatory to ensure efficacy and prevent severe toxicity (nephrotoxicity, neurotoxicity). The standard therapeutic range for maintenance is **0.6 to 1.2 mEq/L**. Levels above 1.5 mEq/L are generally considered toxic. **Why the other options are incorrect:** * **Lorazepam (Benzodiazepine):** These drugs have a wide therapeutic window. Clinical response and side effects (sedation) are monitored clinically rather than through serum levels. * **Amitriptyline (TCA):** While TCAs can be monitored in specific refractory cases, it is not a routine clinical requirement for standard treatment, unlike Lithium. * **Haloperidol (Antipsychotic):** Dosing is guided by clinical improvement of psychotic symptoms and the emergence of extrapyramidal side effects (EPS), not by plasma concentrations. **High-Yield Clinical Pearls for NEET-PG:** * **Sampling Time:** Lithium levels should be drawn **12 hours after the last dose** (Trough level). * **Steady State:** It takes approximately **5 days** (5 half-lives) to reach a steady state before the first level should be checked. * **Monitoring Frequency:** Initially every 1–2 weeks; once stable, every 3–6 months. * **Factors increasing Lithium levels:** Dehydration, low-sodium diet, and drugs like **NSAIDs, Thiazides, and ACE inhibitors** (mnemonic: **NSA**). * **Side Effects:** Ebstein’s anomaly (teratogenic), Nephrogenic Diabetes Insipidus, and Hypothyroidism.

Question 1

Which of the following are features of serotonin syndrome associated with SSRIs and MAOIs?

Accepted Answer

Tremors, Agitation, Cardiovascular collapse

Answer

Agitation, Cardiovascular collapse

Answer

Tremors, Cardiovascular collapse, Hypothermia

Answer

Agitation, Cardiovascular collapse, Hypothermia

Question 2

Which of the following drugs is the first-line treatment for Tourette's syndrome?

Accepted Answer

Haloperidol

Answer

Chlorpromazine

Answer

Olanzapine

Answer

Risperidone

Question 3

Which of the following is the treatment of choice for patients with schizophrenia who refuse to take treatment?

Accepted Answer

Fluphenazine

Answer

Clozapine

Answer

Thioridazine

Answer

Olanzapine

Question 4

Which of the following drugs is both effective and safe to use in a pregnant patient suffering from bipolar disorder?

Accepted Answer

Olanzapine

Answer

Carbamazepine

Answer

Lithium

Answer

Valproic acid

Question 5

Which of the following psychiatric disorders, apart from depression, are selectively treated with serotonin reuptake inhibitors?

Accepted Answer

All of the above

Answer

Phobias

Answer

Obsessive compulsive disorder

Answer

Post-traumatic stress disorder

Question 6

A patient in the emergency department exhibits psychosis. Pharmacological intervention to decrease psychosis would most likely involve which of the following mechanisms?

Accepted Answer

Blockade of dopaminergic neurotransmission

Answer

Stimulation of dopaminergic neurotransmission

Answer

Blockade of nitrergic neurotransmission

Answer

Stimulation of nitrergic neurotransmission

Question 7

A 23-year-old male with schizophrenia, currently maintained on risperidone for 2 months, has no family history of the disease. For how long should the medication be continued?

Accepted Answer

2 years

Answer

5 years

Answer

6 months

Answer

12 months

Question 8

What is the most accurate treatment for erectile dysfunction?

Accepted Answer

Sildenafil

Answer

Master and Johnson technique

Answer

Beta blockers

Answer

Papaverine

Question 9

A 30-year-old female, married for one year, presents with hyperactivity for the past two weeks. A diagnosis of mania is made. She has had three prior episodes of mania in the last 5 years, and each time, she returns to her premorbid state after taking medication. Her urine pregnancy test is positive. Which is the preferred drug for the management of this patient?

Accepted Answer

Haloperidol

Answer

Promethazine

Answer

Clonazepam

Answer

Lithium

Question 10

Which of the following drugs requires serum level monitoring?

Accepted Answer

Lithium

Answer

Lorazepam

Answer

Amitriptyline

Answer

Haloperidol

Psychopharmacology — MCQs

Psychopharmacology — MCQs

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