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Related Experiment Videos

Second generation antidepressants

B Shopsin

    The Journal of Clinical Psychiatry
    |December 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Newer antidepressant drugs challenge the role of monoamines in depression treatment. Research suggests current animal models for predicting drug efficacy need revision for better antidepressant development.

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    Area of Science:

    • Neuroscience
    • Pharmacology
    • Psychiatry

    Background:

    • Research into depressive illness often involves clinical pharmacotherapy with novel investigational drugs.
    • These new compounds possess unique chemical properties and differ significantly from traditional tricyclic and monoamine oxidase inhibitor (MAOI) antidepressants.

    Purpose of the Study:

    • To critically evaluate the clinical efficacy and neurochemical profiles of newer antidepressant compounds.
    • To assess the relevance of traditional animal models in predicting the efficacy of novel antidepressants.
    • To question the established role of monoamines in antidepressant action and the pathophysiology of affective disorders.

    Main Methods:

    • Investigational drugs with defined pharmacological and biochemical activity were studied.

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  • Animal pharmacology and neurochemical studies were conducted to compare new compounds with standard reference drugs.
  • Clinical efficacy data of newer compounds were critically evaluated.

    • Main Results:

    • Newer compounds exhibit diverse pharmacological profiles, differing from classic antidepressants in their effects on central monoamine metabolism.
    • Mechanisms of action vary widely, including pre- and postsynaptic effects, re-uptake inhibition, enhanced release, precursor activity, receptor agonism, and some with no apparent central effect.
    • Clinical efficacy of these newer agents suggests limitations in the monoamine hypothesis for antidepressant effects and affective disorders.

    Conclusions:

    • The clinical efficacy of newer antidepressants questions the sole involvement of monoamines in antidepressant action and affective disorders.
    • Classic animal screening models are inadequate for predicting the efficacy of many novel antidepressants.
    • Revision of animal-laboratory models is necessary to identify new antidepressant molecules with improved safety profiles, avoiding side effects and contraindications of older drugs.