Pharmacotherapy for anxiety disorders

Pharmacotherapy for anxiety disorders

Pharmacotherapy for anxiety disorders

On this page

SSRIs/SNRIs - The Happy Pills

First-line for most anxiety disorders. Full therapeutic effect may take 4-6 weeks.

ClassExamplesMechanismKey Side EffectsPearls
SSRIsSertraline, Escitalopram↑ SerotoninGI upset, sexual dysfunction, headacheStart low, go slow. Sertraline (50mg), Escitalopram (10mg).
SNRIsVenlafaxine, Duloxetine↑ Serotonin & NorepinephrineSSRI-like + ↑ BP (Venlafaxine), dry mouthVenlafaxine can cause hypertension. Duloxetine also treats neuropathic pain.

Black Box Warning: Increased risk of suicidal thinking and behavior in children, adolescents, and young adults (<25 years). Monitor closely during initial treatment.

Benzodiazepines - The Chill Pills

GABA-A receptor allosteric modulation by benzodiazepines

  • Mechanism: Positive allosteric modulator of the $GABA_A$ receptor, ↑ frequency of $Cl^-$ channel opening.
  • Agents (by half-life):
    • Short: Alprazolam, Midazolam
    • Intermediate: Lorazepam, Oxazepam, Temazepam
    • Long: Diazepam, Chlordiazepoxide
  • Risks: High potential for dependence, tolerance, and withdrawal seizures. Avoid abrupt cessation.

Exam Favorite: Long-acting benzodiazepines like Diazepam or Chlordiazepoxide are first-line for managing alcohol withdrawal syndrome.

📌 Mnemonic: "LOT" benzos (Lorazepam, Oxazepam, Temazepam) are safe in liver failure as they are not metabolized by the liver P450 system.

Other Anxiolytics - The Backup Crew

MedicationMechanismPrimary Use-CaseKey Side Effects
Buspirone5-HT1A partial agonistGAD (non-sedating); no abuse potentialSlow onset (2-4 weeks), dizziness, headache, nausea
HydroxyzineH1 receptor antagonistShort-term anxiety, sedation for proceduresPotent sedation, anticholinergic effects (dry mouth, confusion)
TCAs (Imipramine)NE & 5-HT reuptake inhibitorPanic disorder, GAD (2nd/3rd line)⚠️ Cardiotoxicity (arrhythmia), anticholinergic, lethal in overdose
Beta-blockers (Propranolol)β-adrenergic receptor antagonistPerformance anxiety (e.g., public speaking)Bradycardia, hypotension, bronchospasm (contraindicated in asthma)

Anxiety Tx Algorithm - The Game Plan

  • 1st Line: SSRIs or SNRIs are the mainstay. Allow 4-6 weeks for full effect. A short-term benzodiazepine bridge (2-4 weeks) can manage initial severe symptoms.

⭐ SSRIs can cause a transient ↑ in anxiety (activating symptoms) upon initiation; counsel patients to ensure adherence.

High-Yield Points - ⚡ Biggest Takeaways

  • SSRIs/SNRIs are the first-line treatment for most chronic anxiety disorders, but require 4-6 weeks for therapeutic effect.
  • Benzodiazepines are used for short-term management of acute anxiety and panic attacks; they carry a significant risk of dependence.
  • Buspirone, a non-sedating anxiolytic, is a second-line option for GAD with a slow onset of action.
  • Beta-blockers (e.g., propranolol) are primarily used to control the autonomic symptoms of performance anxiety.
  • CBT, not medication, is the first-line treatment for specific phobia.

Practice Questions: Pharmacotherapy for anxiety disorders

Test your understanding with these related questions

A 42-year-old man comes to the emergency department complaining of chest pain. He states that he was at the grocery store when he developed severe, burning chest pain along with palpitations and nausea. He screamed for someone to call an ambulance. He says this has happened before, including at least 4 episodes in the past month that were all in different locations including once at home. He is worried that it could happen at work and affect his employment status. He has no significant past medical history, and reports that he does not like taking medications. He has had trouble in the past with compliance due to side effects. The patient’s temperature is 98.9°F (37.2°C), blood pressure is 133/74 mmHg, pulse is 110/min, and respirations are 20/min with an oxygen saturation of 99% on room air. On physical examination, the patient is tremulous and diaphoretic. He continually asks to be put on oxygen and something for his pain. An electrocardiogram is obtained that shows tachycardia. Initial troponin level is negative. A urine drug screen is negative. Thyroid stimulating hormone and free T4 levels are normal. Which of the following is first line therapy for the patient for long-term management?

1 of 5

Flashcards: Pharmacotherapy for anxiety disorders

1/10

What are the first-line pharmacologic treatments (2) for panic disorder? _____

TAP TO REVEAL ANSWER

What are the first-line pharmacologic treatments (2) for panic disorder? _____

SSRIs or venlafaxine

browseSpaceflip

Enjoying this lesson?

Get full access to all lessons, practice questions, and more.

Start Your Free Trial