Depressed individuals who are not helped by standard antidepressants may take drugs that block the enzyme responsible for breaking down norepinephrine and serotonin. These drugs are called __________

A) benzodiazepines.
B) monoamine oxidase (MAO) inhibitors.
C) tricyclics.
D) selective serotonin reuptake inhibitors (SSRIs) .

Monoamine Oxidase (MAO) Inhibitors

A class of antidepressant drugs that work by inhibiting the activity of the enzyme responsible for breaking down neurotransmitters such as serotonin and norepinephrine, thereby increasing their levels.

Antidepressants

Medications used to treat depression by affecting neurotransmitters in the brain, often improving mood and emotional state.

Norepinephrine

A neurotransmitter and hormone involved in the body's fight or flight response, affecting alertness and energy levels.