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Unlike MAOIs such as phenelzine, harmine and harmaline are reversible and selective meaning they do not have nearly as high a risk for "cheese syndrome" caused by consuming tyramine-containing foods, which is a risk associated with monoamine oxidase A inhibitors, but not monoamine oxidase B inhibitors. [14] Both MAO-A and MAO-B break down ...
Monoamine oxidase inhibitors (MAOIs) are a class of drugs that inhibit the activity of one or both monoamine oxidase enzymes: monoamine oxidase A (MAO-A) and monoamine oxidase B (MAO-B). They are best known as effective antidepressants , especially for treatment-resistant depression and atypical depression . [ 1 ]
Tranylcypromine, sold under the brand name Parnate among others, [1] is a monoamine oxidase inhibitor (MAOI). [4] [7] More specifically, tranylcypromine acts as nonselective and irreversible inhibitor of the enzyme monoamine oxidase (MAO).
When using a MAO inhibitor (MAOI), an intake of approximately 10 to 25 mg of tyramine is required for a severe reaction, compared to 6 to 10 mg for a mild reaction. [46] Tyramine, like phenethylamine, is a monoaminergic activity enhancer (MAE) of serotonin, norepinephrine, and dopamine in addition to its catecholamine-releasing activity.
Harmaline is a central nervous system stimulant and a "reversible inhibitor of MAO-A ()". [2] This means that the risk of a hypertensive crisis, a dangerous high blood pressure crisis from eating tyramine-rich foods such as cheese, is likely lower with harmaline than with irreversible MAOIs such as phenelzine.
Harmine is a beta-carboline and a harmala alkaloid.It occurs in a number of different plants, most notably the Syrian rue and Banisteriopsis caapi. [3] Harmine reversibly inhibits monoamine oxidase A (MAO-A), an enzyme which breaks down monoamines, making it a Reversible inhibitor of monoamine oxidase A (RIMA).
Phenelzine, sold under the brand name Nardil among others, is a non-selective and irreversible monoamine oxidase inhibitor (MAOI) of the hydrazine family which is primarily used as an antidepressant and anxiolytic to treat depression and anxiety. [3]
Monoamine oxidases (MAO) (EC 1.4.3.4) are a family of enzymes that catalyze the oxidation of monoamines, employing oxygen to clip off their amine group. [1] [2] They are found bound to the outer membrane of mitochondria in most cell types of the body.