Pharmacotherapy for OCD and Related Disorders — MCQs
Drug most useful in the treatment of obsessive compulsive disorder is
Drug of choice for obsessive-compulsive disorder is:
Drug of choice for obsessive-compulsive disorder
In obsessive-compulsive disorder, which medication is NOT used for treatment?
A person going to temple experiences recurrent, intrusive thoughts of abusing God that he finds distressing and cannot control. The most likely diagnosis is:
An 18-year-old girl presents with a circumscribed bald patch. There is no evidence of organic disease. What is the most likely diagnosis?
Which of the following will be LEAST useful in treating Obsessive Compulsive Disorder?
A 40-year-old teacher reports excessive handwashing, counting rituals, and difficulty in completing daily tasks. She believes these actions prevent harm to her students. What is the diagnosis?
A 22-year-old woman presents with complaints of an intense urge to shower, spending hours in the shower and finding it difficult to exit. She follows a rigid sequence of actions while bathing, scrubbing each body part three times in the same order. Although aware that this behavior is abnormal, she becomes anxious if she attempts to deviate from this pattern. Her work as a receptionist is frequently disrupted due to her tardiness, yet she gets along well with her coworkers. What is the most appropriate first-line pharmacological treatment for her condition?
In psychoanalytic terms, obsessive-compulsive disorder is fixed at -
Pharmacotherapy for OCD and Related Disorders Indian Medical PG Practice Questions and MCQs
Question 1: Drug most useful in the treatment of obsessive compulsive disorder is
- A. Doxepin
- B. Fluoxetine (Correct Answer)
- C. Dothiepin
- D. Amoxapine
Explanation: ***Fluoxetine*** - **Fluoxetine** is a **selective serotonin reuptake inhibitor (SSRI)**, which are considered first-line treatments for **obsessive-compulsive disorder (OCD)**. - SSRIs, including fluoxetine, are effective in **reducing the severity of obsessions and compulsions** by increasing serotonin levels in the brain. *Doxepin* - **Doxepin** is a **tricyclic antidepressant (TCA)** that primarily blocks the reuptake of norepinephrine and serotonin but also has significant anticholinergic and antihistaminic properties. - TCAs are generally **less preferred for OCD** due to their side effect profile and **SSRIs** typically showing greater efficacy. *Dothiepin* - **Dothiepin** is also a **tricyclic antidepressant (TCA)** with similar mechanisms and side effects to doxepin. - Like other TCAs, dothiepin is **not a first-line treatment for OCD**; SSRIs are more commonly used due to better tolerability and efficacy. *Amoxapine* - **Amoxapine** is a **tetracyclic antidepressant** with properties similar to TCAs, also acting as a **norepinephrine and dopamine reuptake inhibitor**. - While it has antidepressant effects, amoxapine is **not typically used for OCD** and carries a risk of inducing extrapyramidal side effects.
Question 2: Drug of choice for obsessive-compulsive disorder is:
- A. Sertraline
- B. Fluoxetine (Correct Answer)
- C. Alprazolam
- D. Chlorpromazine
Explanation: ***Fluoxetine*** - **Selective serotonin reuptake inhibitors (SSRIs)** are the first-line pharmacological treatment for **obsessive-compulsive disorder (OCD)**. - **Fluoxetine** was traditionally considered a primary choice for OCD treatment and is FDA-approved for this indication. - It works by selectively inhibiting serotonin reuptake, increasing serotonergic neurotransmission, which is crucial in OCD pathophysiology. - Higher doses are typically required for OCD compared to depression (40-80 mg/day). *Sertraline* - **Sertraline** is also an **SSRI** and equally effective as fluoxetine for OCD treatment. - It is FDA-approved for OCD and considered a first-line option. - In current clinical practice, **all SSRIs (fluoxetine, sertraline, fluvoxamine, paroxetine) are considered equally appropriate first-line choices** with no single "drug of choice." - Selection depends on individual patient factors, side effect profile, and drug interactions. - **Note:** Both fluoxetine and sertraline are correct answers in modern practice; this question reflects historical exam teaching. *Alprazolam* - **Alprazolam** is a **benzodiazepine** used for short-term relief of anxiety and panic attacks. - It does not address the core pathophysiology of OCD (obsessions and compulsions). - Not recommended as monotherapy for OCD; may be used adjunctively for severe anxiety symptoms. *Chlorpromazine* - **Chlorpromazine** is a **first-generation antipsychotic** used primarily for schizophrenia and psychotic disorders. - Not indicated for OCD treatment as monotherapy. - Antipsychotics may be used as **augmentation** in treatment-resistant OCD but only as add-on to SSRIs.
Question 3: Drug of choice for obsessive-compulsive disorder
- A. Haloperidol
- B. Buspirone
- C. Olanzapine
- D. Fluoxetine (Correct Answer)
Explanation: ***Fluoxetine*** - **Selective serotonin reuptake inhibitors (SSRIs)** like fluoxetine are considered **first-line pharmacological treatment for Obsessive-Compulsive Disorder (OCD)** due to their effectiveness in modulating serotonin pathways implicated in the disorder. - Multiple SSRIs (fluoxetine, fluvoxamine, paroxetine, sertraline) and clomipramine are equally effective first-line agents, but **SSRIs are preferred initially** due to better tolerability and safety profile. - Among the given options, fluoxetine is the appropriate choice as an established first-line SSRI for reducing the frequency and intensity of obsessions and compulsions. - **OCD typically requires higher doses and longer duration** (8-12 weeks) compared to depression treatment. *Haloperidol* - **Haloperidol** is a **first-generation antipsychotic** primarily used to treat psychotic disorders (e.g., schizophrenia) and severe behavioral disturbances. - It works by blocking **dopamine D2 receptors** and is not a first-line treatment for OCD, though it might be used as an **augmentation strategy** in severe, treatment-refractory cases, particularly when tic disorders coexist. *Buspirone* - **Buspirone** is an **anxiolytic** primarily used for generalized anxiety disorder (GAD). It acts as a **serotonin 5-HT1A receptor partial agonist**. - While it helps with generalized anxiety, it is **generally ineffective** for the specific obsessions and compulsions characteristic of OCD and is not recommended as monotherapy. *Olanzapine* - **Olanzapine** is a **second-generation antipsychotic** primarily used for schizophrenia and bipolar disorder. It blocks dopamine and serotonin receptors. - It is not a first-line treatment for OCD but can be used as an **adjunct to SSRIs** in severe, treatment-resistant cases, particularly when there is partial response to adequate SSRI trials or comorbid psychotic symptoms.
Question 4: In obsessive-compulsive disorder, which medication is NOT used for treatment?
- A. Sertraline
- B. Clomipramine
- C. Carbamazepine (Correct Answer)
- D. Haloperidol
Explanation: ***Carbamazepine*** - **Carbamazepine** is an **anticonvulsant** and **mood stabilizer** primarily used for **epilepsy** and **bipolar disorder**. - It does not have a primary role in the treatment of **obsessive-compulsive disorder (OCD)**. *Sertraline* - **Sertraline** is a **selective serotonin reuptake inhibitor (SSRI)** approved for **OCD** treatment. - SSRIs are considered **first-line pharmacological agents** for OCD due to their efficacy in reducing obsessive thoughts and compulsive behaviors. *Clomipramine* - **Clomipramine** is a **tricyclic antidepressant (TCA)** that is a potent **serotonin reuptake inhibitor**. - It is one of the **most effective medications for OCD** and has been historically used as a first-line treatment. *Haloperidol* - **Haloperidol**, an **antipsychotic**, can be used as an **augmentation strategy** for OCD that is **resistant to SSRI treatment**. - It may be particularly helpful in OCD presentations with **comorbid tic disorders** or significant behavioral disinhibition.
Question 5: A person going to temple experiences recurrent, intrusive thoughts of abusing God that he finds distressing and cannot control. The most likely diagnosis is:
- A. Schizophrenia
- B. Delusion
- C. Obsessive - Compulsive disorder (Correct Answer)
- D. Mania
Explanation: ***Obsessive-Compulsive disorder*** - This scenario describes **religious obsessions** (also called scrupulosity), a well-recognized subtype of OCD characterized by intrusive, blasphemous thoughts. - The key features include: **unwanted, intrusive thoughts** that are **ego-dystonic** (distressing to the patient), **recurrent**, and **difficult to control** - all hallmarks of obsessions in OCD. - The patient recognizes these thoughts as his own (intact reality testing) but finds them distressing and unwanted, which is pathognomonic for obsessions. - Religious obsessions are among the most common obsessive themes in OCD, particularly in cultures with strong religious values. *Schizophrenia* - Schizophrenia involves **psychotic symptoms** such as delusions, hallucinations, and disorganized thinking with **loss of reality contact**. - While religious themes can occur in schizophrenia, the patient would typically not recognize the thoughts as abnormal or distressing in the same way. - The **preserved insight** and **ego-dystonic nature** of the thoughts argue against a psychotic disorder. *Delusion* - A delusion is a **fixed, false belief** held with conviction despite evidence to the contrary and not in keeping with one's cultural background. - In this case, the patient experiences **intrusive thoughts** (not beliefs), recognizes them as problematic and unwanted, and likely does not believe in their validity. - The **ego-dystonic** quality and intact insight differentiate this from a delusional belief. *Mania* - Mania presents with **elevated or irritable mood**, increased energy, grandiosity, decreased need for sleep, and racing thoughts. - While mania may include racing thoughts, they are typically **ego-syntonic** (consistent with the person's inflated self-image) rather than distressing. - The core feature here is a **specific, intrusive, distressing thought**, not the pervasive mood elevation and associated symptoms of mania.
Question 6: An 18-year-old girl presents with a circumscribed bald patch. There is no evidence of organic disease. What is the most likely diagnosis?
- A. Depression
- B. OCD
- C. Phobia
- D. Trichotillomania (Hair-Pulling Disorder) (Correct Answer)
Explanation: ***Trichotillomania (Hair-Pulling Disorder)*** - This condition is characterized by the **recurrent pulling out of one's hair**, resulting in noticeable hair loss or **bald patches**. - The description of a **circumscribed bald patch** without evidence of organic disease in an 18-year-old girl is highly suggestive of trichotillomania, especially given that organic causes of hair loss have been ruled out. *Depression* - While depression can be a **comorbid condition** with trichotillomania, it does not directly cause a circumscribed bald patch. - Depression is a **mood disorder** primarily characterized by persistent sadness, loss of interest, and other emotional and physical symptoms. *OCD* - **Obsessive-compulsive disorder** (OCD) involves intrusive thoughts (obsessions) and repetitive behaviors (compulsions). - Although trichotillomania can share some characteristics with OCD (e.g., repetitive behavior), it is classified as a distinct **body-focused repetitive behavior disorder** in the DSM-5, not OCD itself. *Phobia* - A phobia is an **anxiety disorder** defined by an intense and irrational fear of a specific object or situation. - Phobias do not directly cause **physical symptoms** like bald patches; their primary manifestation is avoidance and panic in the presence of the feared stimulus.
Question 7: Which of the following will be LEAST useful in treating Obsessive Compulsive Disorder?
- A. Cognitive behavioral therapy
- B. SSRIs
- C. Clomipramine
- D. Systematic desensitisation (Correct Answer)
Explanation: ***Systematic desensitisation*** - This therapy is primarily used to treat **phobias** and other **anxiety disorders** where avoidance is a key feature and a clear, single trigger can be identified. - While it involves exposure, the gradual hierarchy and relaxation training are less effective for the complex, intrusive thoughts and compulsive rituals characteristic of **OCD**. *Cognitive behavioral therapy* - **CBT, particularly Exposure and Response Prevention (ERP)**, is considered the gold standard psychotherapy for OCD. - It directly addresses the **obsessions** by exposing the individual to feared thoughts or situations and then preventing the ritualistic responses. *SSRIs* - **Selective Serotonin Reuptake Inhibitors (SSRIs)** are the first-line pharmacological treatment for OCD due to their efficacy in reducing obsessive thoughts and compulsive behaviors. - They work by increasing the availability of **serotonin** in the brain. *Clomipramine* - **Clomipramine** is a tricyclic antidepressant (TCA) with potent **serotonergic effects**, making it highly effective in treating OCD, often when SSRIs are partially effective or not tolerated. - It is specifically approved for OCD and is sometimes considered a second-line or augmentation strategy.
Question 8: A 40-year-old teacher reports excessive handwashing, counting rituals, and difficulty in completing daily tasks. She believes these actions prevent harm to her students. What is the diagnosis?
- A. Generalized anxiety disorder
- B. Obsessive-compulsive disorder (Correct Answer)
- C. Paranoid schizophrenia
- D. Phobic disorder
Explanation: ***Obsessive-compulsive disorder*** - The patient's presentation of **recurrent, intrusive thoughts** (worries about students' harm) and **repetitive behaviors** (excessive handwashing, counting rituals) performed to reduce anxiety or prevent a dreaded event is characteristic of OCD. - The individual recognizes that these obsessions or compulsions are **excessive or unreasonable**, causing significant distress and impairment in daily functioning. *Generalized anxiety disorder* - This disorder is characterized by **persistent and excessive worry** about various aspects of life, not typically focused on specific, intrusive obsessions leading to compulsive rituals. - While anxiety is present, it does not manifest as specific **compulsive behaviors** performed in response to obsessions. *Paranoid schizophrenia* - Schizophrenia involves **psychotic symptoms** such as delusions (fixed false beliefs, often persecutory), hallucinations, disorganized speech, and negative symptoms. - The patient's symptoms are not indicative of a thought disorder, delusions, or hallucinations but rather anxiety-driven, repetitive behaviors. *Phobic disorder* - **Phobic disorders** involve intense, irrational fear of specific objects or situations (e.g., social phobia, specific phobia). - The patient's symptoms are not primarily triggered by a specific phobic stimulus but rather by intrusive thoughts leading to ritualistic behaviors.
Question 9: A 22-year-old woman presents with complaints of an intense urge to shower, spending hours in the shower and finding it difficult to exit. She follows a rigid sequence of actions while bathing, scrubbing each body part three times in the same order. Although aware that this behavior is abnormal, she becomes anxious if she attempts to deviate from this pattern. Her work as a receptionist is frequently disrupted due to her tardiness, yet she gets along well with her coworkers. What is the most appropriate first-line pharmacological treatment for her condition?
- A. Fluvoxamine (Correct Answer)
- B. Haloperidol
- C. Quetiapine
- D. Buspirone
Explanation: ***Fluvoxamine*** - The patient's symptoms of intense urges, compulsive showering rituals, and significant anxiety upon deviation are characteristic of **Obsessive-Compulsive Disorder (OCD)**. - **SSRIs** (Selective Serotonin Reuptake Inhibitors), such as fluvoxamine, are considered the first-line pharmacologic treatment for OCD due to their efficacy in reducing obsessive thoughts and compulsive behaviors. *Buspirone* - Buspirone is an **anxiolytic** primarily used for generalized anxiety disorder, but it has limited efficacy in treating the core symptoms of OCD. - It works as a **serotonin 5-HT1A receptor partial agonist** and does not target the specific neurochemical imbalances associated with OCD. *Haloperidol* - Haloperidol is a **first-generation antipsychotic** used to treat psychotic disorders (e.g., schizophrenia) and severe behavioral disturbances. - It is not indicated for OCD as a primary treatment and its side effects, including **extrapyramidal symptoms**, make it unsuitable for this condition unless there are comorbid psychotic features. *Quetiapine* - Quetiapine is a **second-generation antipsychotic** used for conditions like schizophrenia, bipolar disorder, and as an adjunct for major depressive disorder. - While sometimes used **off-label as an augmentation strategy** in refractory OCD, it is not considered a first-line treatment and carries a risk of metabolic side effects.
Question 10: In psychoanalytic terms, obsessive-compulsive disorder is fixed at -
- A. Oral stage
- B. Genital stage
- C. Anal stage (Correct Answer)
- D. Oedipal stage
Explanation: ***Anal stage*** - In psychoanalytic theory, **obsessive-compulsive disorder (OCD)** is often conceptualized as a fixation at the **anal stage** of psychosexual development. - The anal stage (ages 1-3) is associated with issues of **control, orderliness, cleanliness, and defiance**, which parallel many symptoms seen in OCD, such as excessive neatness, rigid routines, and fear of contamination. *Oral stage* - The oral stage (birth to 1 year) is associated with behaviors like **smoking, overeating, nail-biting, and dependency**, stemming from unmet oral needs. - Fixation at this stage typically leads to issues related to **dependency** and **trust**, not the control and orderliness seen in OCD. *Genital stage* - The genital stage (puberty onwards) represents mature sexual interests and healthy psychological functioning, where conflicts from earlier stages are hopefully resolved. - Fixation at this stage is not typically associated with specific neurotic disorders like OCD but rather with overall difficulty in forming mature relationships. *Oedipal stage* - The Oedipal stage refers to the **phallic stage** (ages 3-6), characterized by the **Oedipus complex** (or Electra complex for girls), where children develop sexual desires for the opposite-sex parent and rivalry with the same-sex parent. - Fixation at this stage is linked to issues of **gender identity, authority problems**, and **sexual inhibition**, not the specific symptoms of OCD.
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