Drugs work by altering the production of neurotransmitters. For example, an antidepressant, an SSRI specifically, will inhibit the neurotransmitter serotonin in certain parts of your brain, but that inhibition causes the increase of serotonin in other parts of your brain, it increases it in the parts of your brain that will help with depression, but it also increases it in other unintended parts of your brain, that’s how side effects occur. Developing a perfect drug requires causing the increase of a/multiple neurotransmitter(s) in only the intended part(s) of the brain.
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