What is the best medication for anxiety and panic in an 83‑year‑old man currently taking buspirone 5 mg twice daily without adequate response?

Switch to an SSRI (Sertraline or Escitalopram) as First-Line Treatment

For an 83-year-old man with inadequate response to buspirone 5 mg BID for anxiety and panic, I recommend discontinuing buspirone and initiating an SSRI—specifically sertraline starting at 25 mg daily or escitalopram 5 mg daily—as these agents have superior evidence for treating both generalized anxiety and panic disorder in elderly patients.

Why Buspirone Is Insufficient

Buspirone has significant limitations for this clinical scenario:

• Ineffective for panic disorder: Research demonstrates buspirone is not significantly superior to placebo for panic symptoms 1. In an 8-week controlled trial, buspirone showed no meaningful antipanic effects compared to placebo, despite having fewer side effects than imipramine.

• Delayed onset: Buspirone requires 2-4 weeks to become effective and is only useful for mild-to-moderate agitation 2. Your patient's current dose of 5 mg BID is at the lower end of the therapeutic range (maximum 20 mg TID) 2, but given the lack of efficacy for panic disorder, dose escalation is not the solution.

• Limited evidence in elderly: While one small study (N=46) showed buspirone had anxiolytic effects in elderly GAD patients 3, it was inferior to sertraline at weeks 2 and 4, with no advantage by week 8.

Recommended Treatment Algorithm

First-Line: SSRI Therapy

Start with sertraline 25 mg daily OR escitalopram 5 mg daily

SSRIs are the evidence-based first-line treatment for both anxiety and panic disorder:

• Sertraline showed superior efficacy to buspirone in elderly GAD patients, with steady improvement throughout 8 weeks and excellent tolerability 3. For panic disorder specifically, sertraline ranks among the most effective medications 4.

• Escitalopram/citalopram have the least effect on CYP450 enzymes, minimizing drug-drug interactions—critical in an 83-year-old likely on multiple medications 5.

Titration approach for elderly patients:

• Start at half the usual adult dose (sertraline 25 mg or escitalopram 5 mg)
• Increase by the starting dose increment every 1-2 weeks as tolerated
• Target therapeutic doses: sertraline 50-100 mg daily, escitalopram 10-20 mg daily
• Allow 4-8 weeks at therapeutic dose for full effect 2

Critical Safety Considerations in This 83-Year-Old

Before prescribing, assess:

• Cardiac history: Obtain ECG if history of QT prolongation or arrhythmias. Citalopram should be avoided if QT prolongation present, as doses >40 mg/day are associated with Torsades de Pointes 5
• Current medications: Check for drug interactions, particularly other serotonergic agents (risk of serotonin syndrome) and drugs metabolized by CYP2D6
• Renal/hepatic function: SSRIs are generally safe but may require dose adjustment in severe impairment

Common pitfall to avoid: Starting at full adult doses. Elderly patients have altered pharmacokinetics and increased sensitivity to side effects. Initial anxiety or agitation can occur with SSRIs, so starting low prevents early discontinuation 5.

Second-Line: Short-Term Benzodiazepine Bridge (If Severe Symptoms)

If panic attacks are frequent and severely impairing function while awaiting SSRI onset:

Add lorazepam 0.25-0.5 mg as needed (maximum 2 mg/24 hours in elderly) 6

• Use only for 2-4 weeks during SSRI titration
• Lorazepam has no active metabolites and shorter half-life, making it safer in elderly 2
• Caution: The 2019 AGS Beers Criteria strongly recommend avoiding benzodiazepines in older adults due to increased fall risk, cognitive impairment, and dependence 7. Use only if absolutely necessary and taper as soon as SSRI becomes effective.

Alternative If SSRI Fails or Is Contraindicated

Venlafaxine XR 37.5 mg daily (SNRI class)

• Effective for both GAD and panic disorder 5, 4
• Requires monitoring for blood pressure elevation and cardiac conduction abnormalities in elderly 8
• Titrate by 37.5-75 mg weekly to target dose of 150-225 mg daily

What NOT to Do

Do not increase buspirone dose: The evidence shows buspirone is ineffective for panic disorder regardless of dose 1. Continuing ineffective treatment delays appropriate care.

Avoid tricyclic antidepressants (despite their efficacy): TCAs carry significant cardiac toxicity risk, anticholinergic effects, and orthostatic hypotension in elderly patients 8, 2. While effective for panic disorder 4, the risk-benefit ratio is unfavorable at age 83.

Do not use benzodiazepines as monotherapy: While alprazolam and clonazepam are highly effective for panic disorder 4, chronic benzodiazepine use in elderly patients increases fall risk, fractures, cognitive impairment, and dependence 7. They should only serve as short-term adjuncts.

Monitoring Plan

• Week 1-2: Assess tolerability, side effects (nausea, initial anxiety, GI symptoms)
• Week 2-4: Titrate dose upward if tolerated
• Week 4-8: Assess response using standardized anxiety scales; full therapeutic effect expected by 6-8 weeks
• Ongoing: Monitor for suicidal ideation (FDA black box warning for antidepressants in patients up to age 24, but vigilance warranted in all ages), falls, hyponatremia (SIADH risk in elderly on SSRIs)

5, 6, 2, 3, 9, 1, 4