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Treatment-emergent depression with antidepressants in panic disorder.

Two patients with panic disorder received therapeutic doses of antidepressants. They developed endogenomorphic symptoms of major depression according to DSM-III-R criteria despite remission of their panic attacks. Treatment-emergent depression in panic disorder has been previously associated with high potency benzodiazepines. Whether antidepressant medications may unmask a depressive diathesis or are coincidentally associated with depression is discussed in this report.

Agoraphobia↗
PubMed1985

Why is amitriptyline much weaker than desipramine at decreasing beta-adrenoceptor numbers?

Desipramine is consistently more effective than amitriptyline at causing beta-adrenoceptor down-regulation. Atropine, mepyramine, ketanserin, cyproheptadine and citalopram did not modify this action of desipramine in rats. Therefore inhibition of either muscarinic, histamine-H1, and 5-HT receptors or 5-HT uptake produced by amitriptyline is unlikely to account for its weaker effect on beta-adrenoceptors. A more likely explanation implicates noradrenaline uptake inhibition in vivo since amitriptyline was much weaker than desipramine and only effective after repeated dosing.

Amitriptyline↗