So depression is not due to low serotonin levels but the first port of call in drugs to fix it is usually SSRIs which increase serotonin levels?
I will quite happily admit to not understanding the biological aspects of depression (although that pic came from a doctor, don't think it was his work) but I am acutely familiar with the emotional and behavioural side of depression.
Anti depressants target various neurotransmitter systems in the brain, including noradrenaline and dopamine. Doctors have the most experience with SSRI's and they are one of the safest so they are prescribed first.
You have to remember that you can treat the symptoms without treating the root cause.
actually citalopam is being phased out due to heart side effects.
Nice guidelines recommend citalopram or sertraline before any other antidepressant. In no school of thought is venlafaxine an appropriate first line drug given it's toxicity in overdose.
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So depression is not due to low serotonin levels but the first port of call in drugs to fix it is usually SSRIs which increase serotonin levels?

