An inhibitor slows or stops something else.
In the case of fluoxetine it’s not inhibiting another medication but a process in the brain called serotonin reuptake. Serotonin is a neurotransmitter, a chemical that helps the brains cells communicate. Normally the brain pumps a certain amount of serotonin into the brain space around the neurons and then reabsorbs or reuptakes some of it to maintain certain levels. Fluoxetine (and other drugs like it) partially block some of the parts of the brain cells that reabsorb serotonin, thus maintaining higher levels in the brain. For reasons that are still not fully understood this helps reduce/eliminate the symptoms of some conditions like clinical depression and OCD.
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