In terms of the proposed sites of action of antidepressant drugs,which of the following would be expected to produce a therapeutic benefit?

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Antidepressant drugs are known to increase the synaptic levels of neurotransmitters serotonin and/or noradrenaline, thereby enhancing neurotransmission in brain regions that regulate mood and emotions. Options A and D are contradictory to the mechanism of action of antidepressants, as monoamine oxidase inhibitors (which block the enzyme that breaks down serotonin and noradrenaline) and amine depletors (which reduce the amount of these neurotransmitters in nerve terminals) have been found to have antidepressant effects. Option C, a centrally acting beta-2 agonist, is not typically used as an antidepressant medication.

In Terms of the Proposed Sites of Action of Antidepressant β2\beta_{2}β2​

In Terms of the Proposed Sites of Action of Antidepressant $\beta_{2}$