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Anxiety Disorders — Diagnosis & Stepped Care

Differentiate the type first; CBT first-line for all

Field: Mental HealthCode: MH-06Updated: June 2026Reference: RACGP / beyondblue-NICE aligned
Differentiate the type of anxiety first — treatment varies. CBT is commonly first-line across all anxiety disorders; SSRIs are the best-supported drug class. Don't miss comorbid depression (around half of patients) and start SSRIs LOW — anxiety can transiently worsen in the first 1–2 weeks.

Differentiating the 5 main disorders

Type, feature & first screen.

  • GAD: excessive worry across multiple domains ≥6 months — GAD-7; CBT, often plus an SSRI/SNRI.
  • Panic: recurrent unexpected panic attacks + fear of further attacks — PDSS; CBT + SSRI (start very low).
  • Social anxiety: fear of scrutiny/negative judgment in social settings — LSAS / Mini-SPIN; CBT, often plus sertraline or escitalopram.
  • OCD: intrusive thoughts + compulsive behaviours/rituals — Y-BOCS; CBT (ERP) + high-dose SSRI.
  • PTSD: re-experiencing + avoidance + hyperarousal after trauma — PCL-5; trauma-focused CBT/EMDR, often plus an SSRI.

Stepped care by severity (GAD-7)

1
Mild (5–9): psychoeducation, lifestyle measures, online CBT, watchful wait.
2
Moderate (10–14): Mental Health Treatment Plan + CBT (Better Access); avoid benzodiazepines as monotherapy.
3
Moderate–severe: MHTP + CBT + SSRI, started low; review response at 4–6 weeks.
4
Severe / treatment-resistant: switch SSRI or trial an SNRI; psychiatry input.

SSRI choice — start low, go slow

  • Start at roughly half the usual depression starting dose — anxiety can transiently worsen in weeks 1–2.
  • Escitalopram or sertraline — commonly well-tolerated first choices for GAD, panic and social anxiety.
  • Fluoxetine — an option for OCD, which typically needs a higher dose toward the top of the SSRI range.
  • Confirm exact starting/target doses in the AMH or eTG.

Comorbidity & screening

  • Screen for depression (PHQ-9) and substance use (AUDIT-C) at every assessment — high overlap with anxiety.
  • Anxiety can mimic cardiac, thyroid, or GI conditions — exclude organic causes first.
  • Consider OSA screening if hypersomnia/snoring — untreated OSA can worsen anxiety.
Benzodiazepine stewardship. Not first-line — CBT and SSRIs treat the disorder; benzodiazepines don't. Reserve for short-term use (commonly ≤2–4 weeks) in acute crisis or while an SSRI takes effect, at the lowest effective dose. Tolerance can develop within 4–6 weeks. If tapering after longer use, individualise the pace — current guidance favours slow, patient-centred reductions, which can take many months for long-term use.

Safety

  • Anxiety can transiently worsen in weeks 1–2 of an SSRI — warn the patient before starting.
  • Avoid benzodiazepines as monotherapy in moderate–severe anxiety.
  • Avoid benzodiazepines in the elderly — falls, confusion, fracture and dementia risk.
  • Screen for suicidality at every review, especially with comorbid depression.

Red flags / refer

  • Treatment-resistant — failed two SSRIs at adequate dose/duration; OCD not responding to high-dose SSRI.
  • Severe PTSD needing specialist trauma therapy (EMDR, prolonged exposure) or complex PTSD.
  • Suicidal ideation with plan or intent.
  • Significant functional impairment despite an adequate treatment trial.

MH-06 v1.0 · Reviewed Jun 2026 · Review Jun 2027

For health-professional use. Stepped care adapted from RACGP psychological strategies and beyondblue/NICE-aligned principles. SSRI choice & benzo stewardship — confirm current dosing at the AMH; deprescribing guidance evolving — see psychotropic.tg.org.au.