No, it is not a monoamine oxidase inhibitor (MAOI).

The monoamine theory of mood suggests that imbalances in neurotransmitters such as serotonin, dopamine, and norepinephrine contribute to mood disorders like depression. It proposes that increasing levels of these neurotransmitters can alleviate depressive symptoms, leading to the development of medications like SSRIs and SNRIs. However, this theory is not a complete explanation for all mood disorders and other factors may also play a role.

A drug that inhibits the absorption of the enzyme monoamine oxidase.

This is an addition to the above-mentioned answer.

To be more specific, monoamine oxidase inhibitor (MAOIs) is an antidepressant which indirectly inhibits the degradations of monoamine by directly inhibiting the enzyme responsible for this degradation process (that enzyme is monoamine oxidase).

1. things

Histamine is classified as a monoamine versus a diamine. There are other types on monoamines including serotonin, epinephrine, norepinephrine, dopamine, and melatonin.