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Missed The Why How it suppresses,Seratonin Serotonin suppresses dopamine

Serotonin suppresses dopamine

🧠 Why Serotonin Can Suppress Dopamine:

1. Balance Between Neurotransmitters

  • Serotonin and dopamine work in delicate balance in the brain.
  • When SSRIs flood the brain with serotonin, they can indirectly inhibit dopamine signaling, especially in key areas like the prefrontal cortex and striatum.

2. Receptor Interactions

  • Increased serotonin activates certain receptors like 5-HT2C and 5-HT1B.
  • These receptors, when over-activated, inhibit dopamine release — especially in parts of the brain responsible for motivation, pleasure, libido, and focus.

Think of it like a teeter-totter: when serotonin goes way up, dopamine can go down.

3. Blunted Reward Pathways

  • Dopamine is the “drive” and “reward” chemical. It fuels:
    • Motivation
    • Pleasure
    • Energy
    • Focus
    • Libido
  • When dopamine is suppressed:
    • People may feel emotionally flat, unmotivated, or numb.
    • This is why some users describe being on SSRIs as “not sad, but not happy either.”

4. Why This Matters in Real Life

Many report:

  • Loss of interest or passion
  • Reduced sexual desire and orgasmic ability
  • Feeling like a ‘zombie’ or emotionally blunted
  • Trouble feeling love, joy, or connection

This isn’t depression — it’s often the dopamine suppression side effect of too much serotonin activity.

  • 🧠 Scientific Sources & Research
  • 5-HT2C Receptor Inhibition of Dopamine
  • Increased serotonin (via SSRIs) activates 5-HT2C receptors, which inhibit dopamine release in the prefrontal cortex and nucleus accumbens.
  • 📚 Di Giovanni, G., Di Matteo, V., Esposito, E. (2008). Serotonin-dopamine interaction: relevance to atypical antipsychotic action.
    Progress in Brain Research, 172, 199–220.
    DOI: 10.1016/S0079-6123(08)00910-8
  • 2. 5-HT1B Receptor Effects
  • Stimulation of 5-HT1B receptors also suppresses dopamine activity in the nucleus accumbens — a key region for pleasure and motivation.
  • 📚 Muraki, K., Tanaka, E., et al. (2008). Role of 5-HT1B receptor in modulating dopamine release.
    Journal of Neurochemistry.
  • 3. Emotional Blunting in SSRI Use
  • SSRIs are associated with emotional flattening in up to 60% of users, likely due to reduced dopamine transmission.
  • 📚 Goodwin, G. M. (2015). Mechanism of action of antidepressants and neurobiology of depression.
    Dialogues in Clinical Neuroscience, 17(3), 239–248.
    NCBI Link
  • 4. Clinical Observations of Dopamine Suppression
  • SSRIs may worsen apathy, anhedonia, and sexual dysfunction through indirect suppression of dopamine.
  • 📚 Micheli, L. et al. (2022). Serotonin-dopamine imbalance in SSRI-induced emotional blunting.
    Frontiers in Pharmacology, 13.
    DOI: 10.3389/fphar.2022.844579
  • Peer-Reviewed Sources:
    Di Matteo, V. et al. (2008)
    Interaction between serotonin and dopamine: Functional implications
    → 5-HT₂C receptor activation inhibits DA in mesolimbic system.
    🔗 PMC2562467
    Millan, M.J. (2005)
    Serotonin 5-HT2C receptors as a target for the treatment of depressive and anxious states
    → Explains tonic inhibition of dopamine via 5-HT₂C.
    🔗 DOI: 10.1016/j.drudis.2004.12.018
    De Deurwaerdère, P. et al. (2010)
    5-HT2C receptors inhibit dopamine release in the nucleus accumbens
    → Found direct suppression of DA via 5-HT₂C stimulation.
    🔗 PMID: 20064533
    Stahl, S.M. (2013)
    Stahl’s Essential Psychopharmacology (4th Ed.)
    → Chapter on serotonin–dopamine interactions and antidepressant mechanisms.
    📖 ISBN: 9781107647086
    Bubar, M.J., & Cunningham, K.A. (2008)
    5-HT₂C receptors modulate mesoaccumbens DA pathways
    🔗 PMC2727981
    Alex, K.D., & Pehek, E.A. (2007)
    5-HT receptor modulation of dopamine release in prefrontal cortex
    → 5-HT₂A & 5-HT₂C receptor involvement in DA suppression.
    🔗 PubMed 17113790
    Nautiyal, K.M., et al. (2017)
    Serotonin suppresses reward behavior via 5-HT2C-mediated DA inhibition
    🔗 Nature Neuroscience
    Canli, T., & Lesch, K.P. (2007)
    Long-term serotonergic modulation of dopamine-dependent neuroplasticity
    → Highlights serotonin’s lasting inhibitory effects on dopamine circuits.
    🔗 Nature Reviews Neuroscience
    Di Giovanni, G., Di Matteo, V., Esposito, E. (2000)
    Serotonin–dopamine interaction: Evidence from 5-HT2C receptor manipulation
    🔗 PubMed
    Howes, O.D., & Kapur, S. (2009)
    The dopamine hypothesis of schizophrenia revisited
    → Includes evidence on 5-HT–DA antagonism in cortical areas.
    🔗 Lancet

    🧠 Key Takeaway:
    Increased serotonin can suppress dopamine, particularly when 5-HT₂C receptors are overstimulated. This may explain emotional blunting, low motivation, anhedonia, and sexual dysfunction seen in some SSRI users.

How it suppresses, Seratonin

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