We don’t know enough about the human body so we are targeting broadly across many areas.
If we target depression we might target serotonin but serotonin modulates a lot of other functions and we don’t know how to target serotonin in just the brain, most serotonin receptors are in the stomach so a common side effect is nausea.
Now we know after 30+ years of targeting serotonin that serotonin might be just modulating something else and that something is what we should be really targeting.
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