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A single panic attack is not the same as panic disorder. Treat with psychological intervention.
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General support, explanation and reassurance, CBT (recommended)
Stress management
Rebreathe into cupped hands or a paper bag if hyperventilating
Initial treatment of the acute attack (only if necessary, usually rarely):
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Prophylaxis for recurrent attacks (panic disorder)
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SSRI antidepressants or
venlafaxine CR 75–225 mg