A 28-year-old man with a 3-year history of specific phobia (fear of flying) is referred for pharmacological management before an upcoming business trip. He has failed cognitive-behavioral therapy. Which drug is the most appropriate choice for acute symptom management in specific phobia?

Explanation

## Pharmacotherapy of Specific Phobia **Key Point:** Specific phobia is primarily managed with cognitive-behavioral therapy (CBT) and exposure therapy. Pharmacotherapy is reserved for acute symptom relief in unavoidable phobic situations, and **β-blockers (propranolol) are the preferred agent** for this limited role. ### Why Propranolol for Acute Phobia Relief? 1. **Mechanism**: Blocks peripheral sympathetic symptoms (tremor, palpitations, tachycardia) without sedation or cognitive impairment 2. **Timing**: Rapid onset (20–30 minutes), ideal for situational use before a feared event 3. **No dependence risk**: Single-dose or short-term use without tolerance or withdrawal 4. **Preserved cognition**: Allows the patient to engage in exposure and learning (unlike benzodiazepines) ### Dosing Strategy Propranolol 20–40 mg taken 30–60 minutes before the phobic stimulus (e.g., boarding a flight) is the standard approach. ### Comparative Pharmacotherapy in Specific Phobia | Agent | Class | Indication in Phobia | Rationale | |-------|-------|----------------------|----------| | **Propranolol** | β-blocker | **Acute symptom relief** (first-choice) | Blocks somatic symptoms; no sedation; no dependence | | Clonazepam | Benzodiazepine | Acute relief (second-line) | Effective but causes sedation, impairs learning, dependence risk | | Paroxetine | SSRI | Chronic anxiety (NOT acute phobia) | Slow onset (2–4 weeks); indicated only if phobia causes persistent anxiety | | Fluoxetine | SSRI | Chronic anxiety (NOT acute phobia) | Slow onset; not suitable for situational use | **High-Yield:** SSRIs are NOT recommended for specific phobia unless the phobia is accompanied by panic disorder or generalized anxiety disorder. Specific phobia alone responds best to exposure therapy + acute β-blocker use. **Clinical Pearl:** The goal in specific phobia is to enable the patient to **approach and remain in the feared situation** so that extinction learning can occur. Sedating agents (benzodiazepines) impair this learning; propranolol allows cognition to remain intact while reducing somatic distress. **Warning:** ~~Do not confuse specific phobia with panic disorder~~ — panic disorder requires long-term SSRI therapy, whereas specific phobia requires exposure therapy + acute propranolol for situational relief. **Mnemonic:** **β-PHOBIA** = β-blockers for Phobia (acute situational anxiety). [cite:Harrison 21e Ch 387; DSM-5]