You’re in the psych section of a Q-bank, you see a panicky patient, and suddenly every option looks plausible: benzos, SSRIs, beta-blockers, antipsychotics, maybe even “give flumazenil.” These questions aren’t just testing “what treats anxiety”—they’re testing time course, indication, risk profile, withdrawal, and what not to do in specific populations.
Tag: Psychiatry > Anxiety, Trauma & Personality
The Vignette (Q-bank style)
A 28-year-old woman presents to the ED with sudden episodes of intense fear that peak within 10 minutes. She reports palpitations, shortness of breath, chest tightness, trembling, and a fear of dying. Over the last month she has had multiple similar episodes, including one while driving, and now avoids highways. She denies substance use. Vitals: T 37°C, BP 128/76, HR 112, RR 22. EKG and troponin are normal. She is visibly anxious and asks for “something that works right now.”
Question: What is the most appropriate acute pharmacologic treatment?
Answer choices:
A. Alprazolam
B. Sertraline
C. Propranolol
D. Buspirone
E. Haloperidol
Step-by-step: Why the Correct Answer Is Correct
✅ Correct: A. Alprazolam (a benzodiazepine)
This presentation is classic for panic disorder (recurrent unexpected panic attacks + maladaptive behavior change like avoidance). In the ED, she wants rapid symptom relief.
Benzodiazepines are:
- Fast-acting anxiolytics (minutes to hours)
- Useful for acute panic attacks and short-term bridging while an SSRI/SNRI takes effect
Mechanism (high-yield):
- Benzos increase frequency of GABA-A channel opening → ↑Cl⁻ influx → neuronal hyperpolarization
- They bind GABA-A allosteric site (distinct from barbiturates)
Key nuance USMLE loves: Benzo use is best framed as short-term/PRN or bridge therapy, not the long-term plan.
Now, Why Every Distractor Is Wrong (and When It Would Be Right)
B. Sertraline — right disorder, wrong time course (for acute relief)
SSRIs (like sertraline) are first-line long-term treatment for:
- Panic disorder
- Generalized anxiety disorder (GAD)
- PTSD
- Social anxiety disorder
Why it’s wrong here: SSRIs take 2–6+ weeks for full effect and can initially worsen anxiety (activation). They don’t solve “I need relief right now in the ED.”
When it would be correct:
- Outpatient long-term management of panic disorder (especially with CBT)
- If the question asked for “best maintenance therapy” or “long-term prevention”
High-yield pearl: Early SSRI side effects include GI upset, sexual dysfunction, sleep changes, and possible initial jitteriness/anxiety → sometimes paired with a short benzo bridge.
C. Propranolol — great for performance anxiety, not panic disorder
Propranolol reduces peripheral adrenergic symptoms (tremor, palpitations) by blocking β receptors.
Why it’s wrong here: Panic attacks involve episodic intense fear with cognitive/emotional components. Propranolol may blunt physical symptoms but isn’t an effective acute abortive agent for true panic disorder in the way benzos are.
When it would be correct:
- Performance anxiety (e.g., public speaking, stage fright)
- Situational anxiety where tremor/tachycardia is the main issue
Board tip: If the stem says “anxiety only when presenting” → think propranolol. If the stem says “sudden episodes, peak in 10 minutes, fear of dying” → think panic attack.
D. Buspirone — not for acute panic; slow onset and best for GAD
Buspirone is a 5-HT1A partial agonist used for anxiety.
Why it’s wrong here:
- Takes 1–4 weeks to work
- Not particularly helpful for acute panic symptoms
- Less effective if the patient has had prior benzo exposure (common test nuance)
When it would be correct:
- GAD in a patient who needs a non-sedating option and where you want to avoid benzos (e.g., history of substance use disorder)
High-yield comparison:
- Buspirone: no sedation, no dependence, no withdrawal, minimal cognitive impairment
- Benzos: sedation, dependence risk, dangerous with other depressants
E. Haloperidol — for psychosis/agitation, not primary panic
Haloperidol is a high-potency typical antipsychotic (D2 blockade).
Why it’s wrong here:
- This is not psychosis, mania, or delirium-related agitation
- Using antipsychotics for uncomplicated panic is unnecessary and risks adverse effects
When it would be correct:
- Acute agitation with psychosis
- Delirium-associated agitation (haloperidol classically used, though practice varies)
- Tourette syndrome (sometimes)
High-yield adverse effects (typicals):
- EPS (acute dystonia, akathisia, parkinsonism)
- Tardive dyskinesia
- Neuroleptic malignant syndrome
- Hyperprolactinemia (especially risperidone, but can occur)
Benzodiazepines: The High-Yield Core You’ll Be Tested On
Common indications
- Acute anxiety / panic attacks
- Status epilepticus (IV lorazepam, diazepam)
- Alcohol withdrawal (longer-acting like chlordiazepoxide, diazepam; lorazepam if liver disease)
- Insomnia (short-term; generally avoid chronic)
- Acute agitation (often with antipsychotic depending on cause)
- Muscle spasm (e.g., diazepam)
- Procedural sedation (e.g., midazolam)
Major adverse effects & contraindication flags
- Sedation, psychomotor impairment, anterograde amnesia
- Respiratory depression (especially with opioids/alcohol)
- Falls and delirium risk in older adults
- Dependence and withdrawal
Big Step warnings:
- Avoid in patients with substance use disorder when possible
- Avoid/limit in elderly (Beers criteria): confusion, falls
- Use caution in OSA/COPD (respiratory suppression risk)
Withdrawal vs Intoxication (classic USMLE contrast)
| Feature | Benzodiazepine intoxication | Benzodiazepine withdrawal |
|---|---|---|
| Timing | After use/overuse | After stopping (esp. short-acting) |
| Key symptoms | CNS depression, ataxia, slurred speech, somnolence | Anxiety, tremor, insomnia, autonomic hyperactivity |
| Severe complications | Respiratory depression (esp. with opioids/EtOH) | Seizures, delirium |
| Treatment | Supportive; airway | Taper benzo (often convert to longer-acting) |
Memory hook: Withdrawal looks like “alcohol withdrawal” because both remove GABAergic tone → hyperexcitation.
Flumazenil: The “Trick Option” You Didn’t See (but will)
Even when it’s not listed, you should know it.
Flumazenil is a competitive antagonist at GABA-A benzo binding site.
Why Step questions are cautious about it:
- In chronic benzo users, it can precipitate withdrawal seizures
- In mixed overdoses (e.g., benzos + TCAs), it can unmask seizures/arrhythmias
Use case: Selected iatrogenic oversedation (e.g., procedural), with careful risk assessment.
Choosing the Right Benzo (when the question gets picky)
Metabolism clue: “LOT”
Lorazepam, Oxazepam, Temazepam undergo glucuronidation (no oxidative hepatic metabolism) → safer in liver disease and elderly.
| Agent | Common “test use” | Extra note |
|---|---|---|
| Alprazolam | Acute panic | Short-acting; higher withdrawal rebound risk |
| Lorazepam | Status epilepticus, alcohol withdrawal (esp liver disease) | “LOT” drug |
| Diazepam/Chlordiazepoxide | Alcohol withdrawal | Long half-life |
| Midazolam | Procedural sedation | Very short-acting |
How Q-banks Want You to Think (Pattern Recognition)
If the stem emphasizes “right now”
- ED panic symptoms, acute severe anxiety, agitation → benzodiazepine (short-term)
If the stem emphasizes “for the next 6 months”
- Panic disorder/PTSD/GAD maintenance → SSRI/SNRI + CBT
If the stem emphasizes “only when presenting”
- Performance anxiety → propranolol
If the stem emphasizes “history of substance use”
- Avoid benzos; consider SSRI/SNRI, buspirone (for GAD), therapy
Takeaway: One Sentence You Can Use on Test Day
Benzodiazepines are rapid-acting for acute panic/anxiety but are not the long-term plan because of sedation, dependence, and dangerous synergy with other CNS depressants—SSRIs/SNRIs + CBT are for maintenance.