Fluoxetine is a Selective Serotonin Reuptake Inhibitor (SSRI). Its primary mechanism of action is to selectively inhibit the reuptake of serotonin (5-HT) into the presynaptic neuron. This leads to an increased concentration of serotonin in the synaptic cleft, enhancing serotonergic neurotransmission and ultimately alleviating symptoms of depression and anxiety. Other options describe mechanisms of other classes of psychotropic medications (e.g., dopamine reuptake blockade for stimulants, muscarinic antagonism for tricyclic antidepressants, GABA potentiation for benzodiazepines).
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