Tetrahydroharmine is both SSRI and MAOI, so its possible that ibogaine is as well. Also, different MAOI's behave very differently, being either reversible (simply binding to an MAO enzyme with different affinities) or permanent (causing oxidation damage to the enzyme so that it will not function) and/or down regulating the bodies natural enzyme production, and effecting a different subset of the *huge* number of metabolism enzymes the body produces. I've personally never seen a very satisfactory explanation of what factors contribute to serotonin and cheese syndrome and why some MAOI's cause these conditions and others don't.